var instructions = [];
var registers = {a: 0, b: 0, c: 0, d: 0};

var instructionSet = {};

instructionSet.cpy = (a, b)=>{
  if(Number.isInteger(parseInt(a))){
    registers[b] = parseInt(a);
  }
  else{
    registers[b] = registers[a];
  }
}

instructionSet.inc = (a)=>{
  registers[a]++;
}

instructionSet.dec = (a)=>{
  registers[a]--;
}

instructionSet.jnz = (a, b)=>{
  if((registers[a] != 0) || ((parseInt(a) != 0) && (!isNaN(parseInt(a))))){
    pc = pc + (parseInt(b) - 1);
  }
}

var input = require("fs").readFileSync("input.txt").toString().replace(/\r/g, "");
var instructions = input.split("\n").filter((a)=>(a)).map((instruction)=>{
  if(instruction.indexOf("cpy") > -1){
    var instructionParts = instruction.match("cpy ([^ ]+) ([^ ]+)");
    return ["cpy", [instructionParts[1], instructionParts[2]]];
  }
  if(instruction.indexOf("inc") > -1){
    var instructionParts = instruction.match("inc ([^ ]+)");
    return ["inc", [instructionParts[1]]];
  }
  if(instruction.indexOf("dec") > -1){
    var instructionParts = instruction.match("dec ([^ ]+)");
    return ["dec", [instructionParts[1]]];
  }
  if(instruction.indexOf("jnz") > -1){
    var instructionParts = instruction.match("jnz ([^ ]+) ([^ ]+)");
    return ["jnz", [instructionParts[1], instructionParts[2]]];
  }
});

var pc = 0;
while(pc < instructions.length){
  instructionSet[instructions[pc][0]].apply(null, instructions[pc][1]);
  pc++;
}
console.log(registers);
console.log(registers[a]);