diff --git a/Cargo.lock b/Cargo.lock
index d6500a6..1f6e5a6 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -12,6 +12,7 @@ dependencies = [
  "num",
  "petgraph",
  "rayon",
+ "xxcalc",
 ]
 
 [[package]]
@@ -300,6 +301,12 @@ version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d29ab0c6d3fc0ee92fe66e2d99f700eab17a8d57d1c1d3b748380fb20baa78cd"
 
+[[package]]
+name = "smallvec"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4c8cbcd6df1e117c2210e13ab5109635ad68a929fcbb8964dc965b76cb5ee013"
+
 [[package]]
 name = "tap"
 version = "1.0.1"
@@ -314,3 +321,12 @@ checksum = "05f360fc0b24296329c78fda852a1e9ae82de9cf7b27dae4b7f62f118f77b9ed"
 dependencies = [
  "tap",
 ]
+
+[[package]]
+name = "xxcalc"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4c2725420f62b8c706cd7f710b45bc30a702de16b092114b84bd0bb6d9cccdbc"
+dependencies = [
+ "smallvec",
+]
diff --git a/Cargo.toml b/Cargo.toml
index 0be3bff..70d8474 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -12,3 +12,4 @@ nom = "7.1.1"
 num = "0.4.0"
 petgraph = "0.6.2"
 rayon = "1.6.1"
+xxcalc = "0.2.1"
diff --git a/inputs/day21.txt b/inputs/day21.txt
new file mode 100644
index 0000000..b9daf1a
--- /dev/null
+++ b/inputs/day21.txt
@@ -0,0 +1,2399 @@
+zsdb: gqzc + wrwl
+hlgq: tdbl + nhvq
+gmmb: 3
+mrzs: cjqw * rjbf
+pgrc: nqdc - hrsg
+wclq: tmcg * jrvf
+zbtn: 7
+gbqg: mhqc + lmpd
+ztch: 2
+gffd: pllp + fmhd
+cvcn: 5
+swvf: mrwq * pvfm
+scsr: dsqb + mhjq
+wtct: twzc * dtvs
+jvhl: 2
+ssfb: hdlp / fzdq
+bpmw: 5
+rnpf: fsnw * ctql
+fnph: glmv * czjs
+jbfc: fjqb * vmcv
+nlhn: wlth + smsl
+cjhz: blbz + zdtq
+vsng: lllm + mccv
+rslz: fztm + wlmp
+gqzc: fnwl * wmbm
+wdvq: vfqb * fqgt
+vrsq: hwgw / ptql
+sfcz: nzgc + hgpf
+nvth: 5
+qvnf: 3
+lqjr: zbbw * qtvs
+sddl: bqlf * bqml
+lnwc: hblf + lmsz
+hwwf: lmjb + lptl
+zvws: 2
+lslm: pszd * lwsm
+chbt: cwjf + bpmt
+mtbl: fqhn - nbrv
+hnbq: 5
+thdf: czlj + ntrv
+rjrl: wmcn * zsqf
+zlsd: ztqf + nqrb
+lvsv: rstc + psvj
+plqw: dqqz + tjds
+hcvm: 3
+dcll: mtql * cmns
+dtpd: lcpr - csjp
+jsfc: 13
+cmns: 3
+cdhn: dscg + hgsj
+sjbr: 2
+ldrn: lvrz + hdhz
+fjlj: 4
+tmmh: 16
+qgzd: 2
+lqzv: 2
+mbjc: 3
+fqws: cspz + bchp
+fsnw: 4
+rfcg: gftf + jpcr
+rmbm: 15
+jnzd: 5
+csbg: bfls + rrhc
+hbtj: 5
+cpdc: 11
+fztm: 3
+rmfs: zgsp + vwbw
+fwrs: 2
+mznn: pbbs * wwsc
+rjbf: 3
+lcth: wnfb * wbjd
+wgwb: 4
+vgth: qjgf + jmnr
+qmnc: 15
+cnfz: 2
+wrtq: 4
+hggh: 2
+ndcz: 3
+qgsh: 4
+hddg: 8
+vmcv: 2
+pgwf: 2
+tdbl: 12
+vhgz: wrqs / zzcv
+hfpp: gtlh + fgqc
+blvh: pphm + dvtz
+csdv: vvvr + ccbz
+mmgv: sdzv + qgqc
+rgjb: 4
+wwrz: 2
+vncb: 3
+qnsc: dwfb + shbc
+gmlt: mstv * sggp
+fjvg: 3
+hgwh: lnbh - zcwv
+bdlb: 8
+hdsc: jlpn - tgrl
+rbzd: szsp + jssf
+vqgz: 2
+qrmr: llqn + hmtp
+swrr: zjps / pjrs
+nbrv: qwgw * mghq
+blmg: vvqw + nnhz
+bjlr: pgrc + lqjr
+jclr: 3
+ttrd: 5
+schf: 2
+pnpr: 2
+vfvw: 13
+qzss: 4
+vfhb: 4
+cbrp: 2
+hhpn: wpqb * hdsr
+frgt: 5
+zctj: sbvs * ghtz
+cdvc: 3
+wwsc: 2
+mblg: 2
+llzv: blmg / hmdc
+rqch: vbtq * vsbg
+nqhz: fsws + fhnv
+qvbp: 2
+hlcg: dlsm - jwjl
+jzdj: 3
+lmsz: 7
+vhpt: gcwp * fqwm
+pzdn: 9
+lvsz: btjr * fvlc
+fwjw: brhb * bvzq
+gssz: 13
+tjdp: rhqm * ncjv
+nrvn: hdsj * chsg
+sjqw: 5
+fdbv: zzqd * njjj
+jmbh: ncbd + jtsn
+wmwb: 4
+jdff: qlws / dwtg
+bqrh: 3
+fnwl: mrvw + zssw
+gfdj: rnnc + vtcf
+chsv: 9
+sqvd: 11
+gndr: lghr * bvlf
+rtnd: 2
+wlbj: wgwb * nfvc
+mnsf: rrcf + rnpf
+pllt: tmmh * jrqq
+qnsp: 2
+jvgr: dnnl * ttzg
+tpgm: zzsn * rhbr
+sljz: 2
+bhlm: ftrn * rqvt
+swmp: ljlm + dgcz
+whvz: jszl / svhr
+sbhc: 2
+mjbb: 3
+wnct: 14
+jfdz: zccl * gfdj
+fglq: 2
+vrqq: hrfd * tdbr
+hlwg: mcln + chfh
+rrrw: 4
+jwqt: ddcf + gdpf
+pjcg: 4
+dpwn: 2
+gtlh: 4
+djvg: mmgv * hvbz
+vvqw: wtfm * cbtr
+dcvz: 2
+tqwq: crsn + zwdc
+fqgt: 10
+tqrp: zpbp * cdvf
+wmcn: 2
+tpnp: bjth + gvpl
+gtln: lcdl * dvql
+lpls: 3
+fndf: 3
+wffl: 16
+bpmt: jrwv * ddsl
+gngh: mplr * mmfb
+cwjj: 5
+cnqp: bmnl + rhbc
+fvsn: 5
+vlrn: wfqb * wmwn
+fwrh: jlpw + drnn
+hpdf: gpwb * dwzn
+lsdp: wlqf + tcdj
+phqh: gbsd + bdqz
+jvrd: fftt + njzq
+mvml: 3
+njjs: swmp + rgfb
+hbcs: stwd + twdn
+ptzt: 2
+scmg: 11
+nhjc: mpzv + bjsp
+gjsr: rbgd * dtmp
+mwbz: 9
+rvdr: pvhc - qmtf
+bchp: 4
+ptbq: 2
+fcrg: 2
+fzms: 2
+pmvs: hgln + lbjj
+lqtd: wzsb * gcps
+vflj: 2
+gpns: gfrp + csbb
+trbt: mgpd + rmfh
+fsbj: 14
+cqwr: cgtn * ndwz
+bvbc: dwrn + jqjs
+srgz: 3
+dfdl: 3
+ncwc: 2
+fgqc: bnhf + qsrq
+jjbb: vtgh + rlst
+qtsm: fvcz * tvmf
+jrqr: hbqh * nqnt
+zbjb: jvbf * rnql
+zdtr: hmwm + djmm
+mtml: 8
+ghsf: 4
+sbnd: 3
+wtfd: fhqd / ccjn
+tcdj: cnmf * cvlv
+ljlm: 3
+cpfl: 2
+vnsr: qrgd + btqm
+sjjh: rfzl + gpns
+qvrd: 3
+gqnm: 9
+mmtt: tfnl * fphb
+mqzj: 4
+lwrq: qdbr * jnct
+vpqd: 3
+scmm: 5
+fhqd: znsl + nhgn
+wgtd: mblg * qjvz
+fnjt: gpbq + gzlj
+zcvs: ffsm + qnsv
+shvb: 2
+nnjj: prtc * ldrn
+nlfc: 2
+qpzd: 2
+qwmd: 2
+vdml: 5
+wwdh: tnjv + tmnc
+npgh: 10
+gtch: zgzc * tfgm
+jvpb: lpfs + jprp
+gtrh: dbdd * qblw
+nsnn: qgnw * pzrl
+zjvw: tdfw * sbnd
+htmt: jhdw + qjpd
+mzrl: nshw / bznr
+swwq: 3
+hjzw: dmvn + cdwq
+ccbl: 3
+ctql: 12
+fgfp: 18
+nftp: fmgs * dtpp
+vggp: 13
+cpnj: nhwc + rpwg
+zcwv: dgvb / hnlv
+drbh: fchq + zzjd
+zcll: 3
+vhtw: vgcz - snvm
+llnn: sttc + gwsc
+qjnr: 18
+bhvb: prpq * ztln
+bdjp: hgjw * gzjd
+trsl: 5
+llqn: 8
+nhjn: fqvv * dhfw
+gfdg: 4
+fthr: 2
+qrgd: 18
+pcfs: 1
+pphm: 4
+mqss: 12
+zwlh: whts + vrtd
+qgfs: 2
+ncml: thpm * jdff
+zffw: 2
+dbdz: 7
+mpzv: 4
+qjvz: fwjw - pbbf
+qfgt: gfzg / rzzr
+bcht: rgvc / smfc
+cjqg: lfnq + pztj
+sgwn: plqc * vnbz
+gplq: hqvg - bplh
+gmst: 15
+gvhp: wshj / qpzd
+zvdz: 5
+fpqn: 10
+hgsj: 5
+dtvc: wvww / cbrp
+cdrv: sdqm + tnfh
+bgww: 3
+vcrr: 11
+ttmh: 4
+bnlz: rvvm * cblp
+wjrb: mbsc + nphf
+gjvs: 6
+lzmh: nbjr * wlbd
+bvdc: ftmp * jwhj
+lvdd: mgfj * vslb
+lbtc: hfpp + wrtz
+wpqb: 2
+tmvj: bbfv / bcdt
+brhg: 2
+lhss: 17
+wrrd: rhrh * hrns
+lbtd: 7
+dzqm: 9
+zbbw: rmrq + zcfq
+vpfc: rfpj * wpnj
+vrtd: 4
+qqcf: 2
+dssj: 3
+sthg: vmwp + fhdq
+dtzl: wwrz * zdgv
+hpng: hjfc * ncwc
+bsgl: 3
+tptp: ztch * dlhr
+rvvm: 2
+tbhf: 6
+tlcd: 4
+gnvp: cbsf - sfmc
+nfjg: rscv * gwpl
+sjvr: tzpv + vrsq
+fzqc: hbvq * gzfb
+lbnw: 5
+jvtc: 5
+mvrf: vhmw / tzqd
+dwmd: blvh * dzqm
+tvzw: 2
+qhhd: wfpj + dcll
+jmsp: 4
+qppt: chjt + hlmh
+vqqm: bljf + ddfm
+hvvb: vqqm / qtnw
+fppz: 20
+cjvm: bjgc + vwzq
+qvbg: 10
+twdg: trsl * wclz
+bgzv: 5
+mmcd: 8
+chzg: 4
+qqmr: 2
+jlnt: 2
+ztmb: bnqd - vdzc
+bmbm: 5
+mwmf: ppcw + mppq
+rlcb: 5
+tvbl: 13
+zvvw: nsgt + fvhl
+tccq: zcll + hhpn
+jrdf: rmtf * bhlm
+ztln: gmvn * zcnd
+lmdm: 2
+scrs: 3
+mgpd: 4
+sjdg: qzjr * mrzp
+nplh: pfzs * zsts
+hmdc: 2
+wcwv: zmmc / gfgw
+rrfp: vgth + tzrd
+wtpn: ddfl / rwww
+whfq: jtsq + ddgd
+rbwd: 16
+hblf: rqtz * sjbr
+pzlm: 7
+czgb: nvft * vnsr
+pldc: gnvp + mvsz
+wmwn: 3
+nfps: 3
+tlfq: jlfg * plbz
+gcwp: 5
+fbwm: 4
+hdwg: 4
+zthn: 2
+gflj: lmsp * hrdh
+nftc: 2
+vqpq: 18
+jhqn: 3
+nwhr: 11
+sjdn: 4
+nlsq: htwt * hrcm
+cblp: blbn / qsqd
+jswm: 2
+dmvn: 2
+wfvp: csdv / vzgl
+zgtc: wcvq * vqfb
+vrqj: sdgs / fzms
+crsn: 9
+bzmf: 5
+zgcs: 5
+pqbm: 2
+jtbd: hgsb + bvtw
+jqjv: 2
+gnmv: lbqz * jzqh
+zdpv: sjfz + lnbg
+gfml: fcln * sfgv
+qpbn: 2
+rljm: 1
+qjtl: wcwv + njjs
+qmqn: wzgn + ltbf
+qddr: rmbm * btht
+bvsq: 9
+ftmp: 3
+gqqp: 5
+rzwv: 2
+ghqg: 5
+fbgh: 5
+hjfl: lqdw * dwvn
+cwmb: zqrb * nwpc
+qqcj: ndwl * lzqs
+nfvc: 2
+hljr: 11
+qfrr: gbzv * mhfw
+bghl: lzjm * lthd
+jgtj: rgnz * zwjm
+ndld: 3
+mrmw: 2
+cqqw: jjjb - smqd
+wbdp: 5
+hnzl: ctpz + qjtl
+sfmc: 4
+crwg: sjjh * jtrn
+gglv: 2
+fdtm: 2
+lmmq: qjgp + hjfl
+hwbl: 6
+hmtp: hhjj - fdlh
+dwvn: 2
+gzds: 2
+hbtv: jzfg * lqzv
+hrvm: 2
+cncv: qzct * vflj
+wzsb: 5
+wwcr: 4
+wpwj: jspd * wsfj
+rbff: 2
+wfbs: tfzf - ztjz
+qdjj: 13
+ncdd: 3
+whnd: swwq * bbff
+bjph: vggv * wnjs
+vfwp: 3
+plqc: nwhr * zjzv
+fpwj: 2
+nbqc: 3
+jztc: 7
+dvpd: zfbs * ltnj
+zcmq: 3
+mcln: 5
+zsqf: qdzh * jnwh
+gpqt: 18
+lzmw: wjdd * zffw
+sqrm: 3
+zhwv: tvrb - lzmw
+bjvm: 3
+wlmp: 8
+rfqr: 5
+mwsw: sglg * btlh
+rqlj: 4
+qmnp: 1
+rdsb: jbfc + cwgq
+zdfz: fdvj + swsh
+gftw: gmwq - rmfs
+rvhf: 2
+thdw: whtg + phvs
+bcsw: 14
+nmqw: 5
+jsdt: nfst + bvrc
+vpbv: 3
+gvpl: vnst + gscf
+tznc: 3
+zssw: sdjd + fghp
+hhps: 3
+frrb: 3
+sfcs: grmm + wtjz
+chnj: 4
+ztdr: tstv + gtjv
+gwzj: cmtl + swtj
+jnhp: jvtc * bvnn
+mgds: 10
+rhmc: 8
+jmnv: mcps + scsr
+nlsl: 2
+pvgq: jmbh * tqzj
+glct: 2
+bfrj: 8
+zzms: 2
+jdgc: 5
+tbtm: cmms + mqzj
+nthr: 4
+dqhv: svvs * ztdr
+lnbg: 12
+tdql: cghc * crwb
+zsnh: gmst + chvw
+zhnq: 3
+rhfw: pzmp * bnlm
+bzmv: nghr * mghd
+mtql: grcq + qjll
+hsgl: 1
+hvsn: zsdb / qgsh
+bnrs: fpwj * svjs
+pnbw: njcz * wcvm
+zhmq: 18
+dwbv: 5
+brrc: 3
+rpbd: djlc + nlcb
+ghqd: csbg - cmlg
+ssss: nbvg * tptp
+wghg: 8
+chvw: rvhf * qlqc
+pzrz: 11
+smqd: 9
+prpq: 2
+cghc: 3
+lncv: pmrf * dwmd
+tmbq: dlcs + cjqg
+cqns: qdhr + fdzr
+hqjw: cmfz + gfml
+dwfb: rvdr / nfgt
+rhbc: 8
+nsmp: 2
+mfjc: 3
+sqjc: sthg * njzd
+llsb: gdgb + jppv
+qbsp: 2
+spsb: 2
+mvqp: 19
+pbbs: vfvw + drmh
+rsdw: tsnn + hfbf
+ppmn: 15
+dszf: wjds - twhh
+tzcp: 3
+vsbj: sqph * fgpj
+wgrn: rpwt * ghsf
+bqlf: 3
+zgqq: tcgc * gbbg
+nfql: 3
+mrwq: 4
+nqhd: 16
+mmvg: zrcw / nlfc
+thsw: hnzl + wsvf
+sbbt: 2
+hfww: 6
+tlzz: 5
+mjpt: 3
+zwsj: 12
+wvpr: mwmf * zwjj
+hfpd: trfp + wbbz
+wwcw: 3
+lpdz: 5
+hsds: 2
+rsmt: fbpz + fdbv
+vsnl: qdtf - qnsp
+mjnw: blbb * mrmw
+pwgd: hpng * gchf
+qdtf: clpd + stdn
+sbnq: mrrw + vbfl
+fftj: 2
+zpbp: zqtz + rjwh
+jbtc: bdwl + dnhm
+cfng: wvrd * jfsz
+pfnw: scrs * bdlb
+cwtp: 4
+trzh: 5
+rngn: 4
+lphp: pvmv + djvg
+trrw: tpzn / hdwg
+cbqm: wrrd + htcd
+zwjj: 3
+mrrw: cfvp + gqlf
+hdhz: zqfq * hzrf
+drsz: gzds * whrn
+rpwt: 4
+fdfr: hphn * cblf
+wzsz: vcrr * cpfl
+lzvv: 2
+lgdw: 15
+rnfh: 5
+gdsj: cgqs * dmgw
+mszm: ctsg * czfh
+hrns: 15
+vnst: 8
+bfvz: jtbq * rqdz
+dflq: wqtq + vqjq
+lvsw: hlgq * cfrb
+qzjr: tmbq / nrmj
+njfq: 7
+lshc: 5
+wlth: crwg - mdnh
+qmdt: 3
+zrmc: 3
+qmhl: 4
+vstl: 3
+cwtm: 2
+wmpp: qqmm * llzv
+wnjs: dgqb * rlfr
+rqsb: 2
+qcwv: zpqg * cjvm
+vfqb: 3
+bhfj: vncb * pldc
+fgqf: wwtw * drzc
+jsln: 3
+qnsv: 1
+pqjn: wnct + lgdw
+grgr: 4
+rrnl: bfrj + llwp
+trmw: 3
+cmfz: hcww * zfth
+cjvf: zlcr * jrmp
+vsql: lgzm * bbbl
+gvzt: rpbd * wjqz
+qdzh: zlwp + njcr
+jjww: 2
+bsnq: nsqd * rsgj
+bvlf: 2
+bsrm: lvdd + wjdr
+tpvh: 2
+wctr: 5
+wgvm: wzll * dcvz
+bplh: 6
+tqhf: pfzr - hrsv
+nbll: 14
+srcp: 6
+jppv: sblh * bfpl
+nlzq: 20
+fnnd: 1
+rwhs: 2
+jwlw: gffd * snbm
+ztcc: jmrp * mhcw
+vjlv: rhnp * wwdh
+gqhh: jlrf * bzmf
+rbgd: 4
+bvlc: 2
+ldqh: 2
+rqts: 3
+brhb: zqjb - sqng
+swsh: cqwr / tptt
+qbrv: rwwg + jmtb
+clbn: 2
+tfwn: ncps + cwsw
+nggd: bvlc * mfrj
+fvlr: rvlg * nscb
+svhr: 3
+rqvt: jdch + vsql
+cgtn: mcpf + fjvg
+fmsh: 3
+snsm: wghg * rhgv
+wtjs: dzhc / qpbn
+sglg: 2
+bdqw: mhdh * dqvd
+zvrp: 3
+ftrn: 3
+nrdh: 11
+dwrp: mndt + bplr
+pclh: jglg * rqlj
+llrb: rgmh * jpgb
+pvww: 13
+bbmm: 5
+svjs: nrqh + bvbc
+fqwm: svmh * sdsm
+ghbw: 11
+bgss: 15
+tzlb: 13
+jwls: cppr / sdmn
+jrqq: 2
+hphn: bvfg + gfvw
+mqms: zznv + dflq
+jwwd: 2
+bnqd: ncml * gjbz
+bvgg: brrc * lqnw
+mbbl: jwdc - tffz
+ncjv: 2
+zgzc: 4
+gqls: mpfc * hvts
+tjhj: fsdz + sfpr
+fsws: rhvr + jqpw
+gncz: 3
+swzr: 2
+fdrb: 10
+bbbl: 2
+gvlh: 2
+sdgs: lrml * nsgv
+zbzr: 9
+jsgh: 4
+fvgv: 2
+whtg: tjpm + nggc
+szsp: 6
+wvrg: cnhq / mszm
+qpsl: 5
+bzbr: vbmh * gwzj
+tmws: 11
+ddgd: 2
+vvwq: 5
+lbgc: dmvs * cnfm
+hjqj: 17
+llcl: 4
+hbvt: svwl - nhhj
+sjhc: 2
+mjzj: 2
+mccv: nzcg * gqmz
+gzsd: rfmh + gpqt
+nrqh: tbqs - qmnc
+qlvn: 2
+vzqq: 4
+nvbs: bzfh * bvfv
+wrrg: fshf / fvlj
+rpcg: mlgn + sslw
+jfnb: 1
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+mhbc: fsfz - tddg
+pzmp: 18
+rmzr: bhvb - wpwj
+hfgs: 4
+pflr: cbbd * cbqm
+fcln: 3
+bcwh: 2
+qbnr: 2
+nzwf: ftsz - cfwn
+zmmd: 3
+jvdm: 2
+wspf: wfch * lvtn
+tcgc: 5
+wthh: 3
+wsgl: ctfr + rbvh
+pwvz: fjtr * bghl
+rqpn: wclq + jwlw
+nwpc: ssmg / rhmc
+hlcq: 2
+mrgd: clzj * rlvm
+wwgn: sljz * wvmj
+twdn: mqms * fszv
+dtjt: qswp * fwhq
+dsqb: 12
+lpbm: 7
+wjdr: fthv * dhwd
+sprj: mtps + prwg
+zltn: wzjw * rqts
+fvcz: zhrd / jvdm
+fjjw: 4
+hgpf: jjsq / dfmj
+tjds: 2
+mglt: mmtt * fcrg
+tczs: 5
+zwzm: crsj / chnj
+rsgj: 3
+ztnd: vlrn + rqch
+cdwq: 5
+hvts: 3
+qvbz: psrg * pbsf
+gtpl: vmjm + gbmq
+rwwg: rdhv + bddw
+vprj: fdwq * zcnv
+rpmd: mdst * gbvz
+pdfb: mqss / wmnq
+nsgv: slmj * nftc
+ltnj: wtpn * vvwq
+wbjd: 7
+wjjg: nqht * crfg
+wnzt: 6
+fqhn: bzsm * dstz
+smsq: gjvs * mmcd
+rcbb: vdml * gvlh
+bnlm: vpfb + nfcr
+vrvh: 3
+fftw: 4
+rcsl: 9
+zzsn: 5
+ffsc: wlnv * rwpb
+rssg: glcv * vmqp
+dgvb: fnph + zhcl
+hjfc: 12
+gfcz: hhps * nvth
+gzzl: 2
+rhqr: cmlp + tbwg
+tvmf: 4
+pfzs: 13
+gbmq: 2
+mpgl: srqt + fbdr
+rlzn: 3
+cstn: 3
+rqtz: nthr * tjct
+mwnw: 15
+gphc: 1
+spvq: pdhv - bjlr
+wmct: mwfz + jshj
+qzgn: gvhp * zzms
+rfpj: pbsm + jpqm
+fftt: gmsh - llcl
+psrg: 2
+hrsg: 12
+lptl: ghbw * nlsl
+pwwh: qjcf * vcct
+bfqr: 7
+zwrd: tgfd * wtct
+znsl: fdsb * hfcf
+cwsw: 1
+fmhl: 3
+trzr: cccf * vpzb
+zspp: gfrs * qzwf
+cfrb: 12
+zvlv: 3
+gcfc: 6
+nvft: swlc * sqcn
+lhqd: pvww + jlqv
+lscj: llrg * mwmr
diff --git a/src/bin/day21_1.rs b/src/bin/day21_1.rs
new file mode 100644
index 0000000..86a9064
--- /dev/null
+++ b/src/bin/day21_1.rs
@@ -0,0 +1,8 @@
+use std::fs;
+
+use aoc2022::day21::process_part_1;
+
+fn main() {
+    let file = fs::read_to_string("./inputs/day21.txt").unwrap();
+    println!("{}", process_part_1(&file));
+}
diff --git a/src/bin/day21_2.rs b/src/bin/day21_2.rs
new file mode 100644
index 0000000..2d87a2b
--- /dev/null
+++ b/src/bin/day21_2.rs
@@ -0,0 +1,8 @@
+use std::fs;
+
+use aoc2022::day21::process_part_2;
+
+fn main() {
+    let file = fs::read_to_string("./inputs/day21.txt").unwrap();
+    println!("{}", process_part_2(&file));
+}
diff --git a/src/day21.rs b/src/day21.rs
new file mode 100644
index 0000000..b21b90c
--- /dev/null
+++ b/src/day21.rs
@@ -0,0 +1,128 @@
+use std::collections::HashMap;
+
+use nom::branch::alt;
+use nom::bytes::complete::tag;
+use nom::character::complete;
+use nom::character::complete::{alpha1, newline, one_of, space1};
+use nom::combinator::map;
+use nom::multi::separated_list1;
+use nom::sequence::separated_pair;
+use nom::IResult;
+use xxcalc::calculator::Calculator;
+
+pub fn process_part_1(input: &str) -> i64 {
+    let (_, monkeys) = parse_input(input).unwrap();
+    monkeys["root"].calc(&monkeys)
+}
+
+pub fn process_part_2(input: &str) -> i64 {
+    let (_, monkeys) = parse_input(input).unwrap();
+    let expr = match monkeys["root"] {
+        Monkey::Add(a, b) | Monkey::Sub(a, b) | Monkey::Mul(a, b) | Monkey::Div(a, b) => {
+            format!("{}={}", build_expr(&monkeys, a), build_expr(&monkeys, b))
+        }
+        _ => unreachable!(),
+    };
+    // Lazy man, i am
+    xxcalc::linear_solver::LinearSolver
+        .process(&expr)
+        .unwrap()
+        .as_f64()
+        .unwrap()
+        .floor() as i64
+}
+
+fn build_expr(monkeys: &HashMap<&str, Monkey>, name: &str) -> String {
+    if name == "humn" {
+        return "x".to_owned();
+    }
+
+    match monkeys[name] {
+        Monkey::Number(x) => format!("{x}"),
+        Monkey::Add(a, b) => format!("({}+{})", build_expr(monkeys, a), build_expr(monkeys, b)),
+        Monkey::Sub(a, b) => format!("({}-{})", build_expr(monkeys, a), build_expr(monkeys, b)),
+        Monkey::Mul(a, b) => format!("({}*{})", build_expr(monkeys, a), build_expr(monkeys, b)),
+        Monkey::Div(a, b) => format!("({}/{})", build_expr(monkeys, a), build_expr(monkeys, b)),
+    }
+}
+
+#[derive(Debug)]
+enum Monkey<'a> {
+    Number(i64),
+    Add(&'a str, &'a str),
+    Sub(&'a str, &'a str),
+    Mul(&'a str, &'a str),
+    Div(&'a str, &'a str),
+}
+
+impl<'a> Monkey<'a> {
+    fn calc(&self, monkeys: &HashMap<&str, Monkey>) -> i64 {
+        match *self {
+            Monkey::Number(i) => i,
+            Monkey::Add(a, b) => monkeys[a].calc(monkeys) + monkeys[b].calc(monkeys),
+            Monkey::Sub(a, b) => monkeys[a].calc(monkeys) - monkeys[b].calc(monkeys),
+            Monkey::Mul(a, b) => monkeys[a].calc(monkeys) * monkeys[b].calc(monkeys),
+            Monkey::Div(a, b) => monkeys[a].calc(monkeys) / monkeys[b].calc(monkeys),
+        }
+    }
+}
+
+fn parse_operation_monkey(input: &str) -> IResult<&str, Monkey> {
+    let (input, lhs) = alpha1(input)?;
+    let (input, _) = space1(input)?;
+    let (input, op) = one_of("+-*/")(input)?;
+    let (input, _) = space1(input)?;
+    let (input, rhs) = alpha1(input)?;
+
+    Ok((
+        input,
+        match op {
+            '+' => Monkey::Add(lhs, rhs),
+            '-' => Monkey::Sub(lhs, rhs),
+            '*' => Monkey::Mul(lhs, rhs),
+            '/' => Monkey::Div(lhs, rhs),
+            _ => unreachable!(),
+        },
+    ))
+}
+
+fn parse_monkey(input: &str) -> IResult<&str, Monkey> {
+    alt((map(complete::i64, Monkey::Number), parse_operation_monkey))(input)
+}
+
+fn parse_input(input: &str) -> IResult<&str, HashMap<&str, Monkey>> {
+    let (input, monkeys) =
+        separated_list1(newline, separated_pair(alpha1, tag(": "), parse_monkey))(input)?;
+    Ok((input, HashMap::from_iter(monkeys.into_iter())))
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    const INPUT: &str = "root: pppw + sjmn
+dbpl: 5
+cczh: sllz + lgvd
+zczc: 2
+ptdq: humn - dvpt
+dvpt: 3
+lfqf: 4
+humn: 5
+ljgn: 2
+sjmn: drzm * dbpl
+sllz: 4
+pppw: cczh / lfqf
+lgvd: ljgn * ptdq
+drzm: hmdt - zczc
+hmdt: 32";
+
+    #[test]
+    fn day1() {
+        assert_eq!(process_part_1(INPUT), 152);
+    }
+
+    #[test]
+    fn day2() {
+        assert_eq!(process_part_2(INPUT), 301);
+    }
+}
diff --git a/src/lib.rs b/src/lib.rs
index a6bed16..8623deb 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -21,3 +21,4 @@ pub mod day17;
 pub mod day18;
 pub mod day19;
 pub mod day20;
+pub mod day21;