const fs = require('fs');

function parseLine(line) {
  let [ op, offset ] = line.split(' ');

  return { op: op, offset: Number(offset), visited: false };
}

fs.readFile('input', (err, data) => {
  if (err) throw err;
  let program = data.toString().split("\n").map( parseLine ).flat();

  let acc = 0;
  let pc = 0;

  while (true) {
    let insn = program[pc];
    if (insn.visited) {
      console.log(acc);
      break;
    }

    insn.visited = true;

    switch (insn.op) {
    case 'nop':
      pc++;
      break;
    case 'jmp':
      pc = pc + insn.offset;
      break;
    case 'acc':
      acc = acc + insn.offset;
      pc++;
      break;
    }
  }
});