const fs = require('fs/promises');

const main = async () => {
  const input = (await fs.readFile("./input.txt", 'utf8')).split("\n\n");

  const getItem = (itemStr) => {

    const val = parseFloat(itemStr);

    const remainders = Array.from(Array(19).keys()).map((_, i) => val % (i + 1));

    const isDivisibleBy = (n) => remainders[n - 1] === 0;

    const inspect = str => {
      remainders.forEach((rem, i) => {
        const div = i + 1;
        remainders[i] = eval(`const old = ${rem}; const _${str}; _new;`) % div;
      });
    };

    return {
      isDivisibleBy,
      inspect
    };
  };

  const getMonkey = (str) => {
    const rows = str.split("\n").slice(1).map(r => r.split(": ")[1]);

    const items = rows[0].split(", ").map(getItem);

    const inspectOp = rows[1];

    const testDiv = parseFloat(rows[2].split(" ")[2]);

    const trueTarget = rows[3][rows[3].length - 1];
    const falseTarget = rows[4][rows[4].length - 1];

    let inspectCount = 0;

    const takeTurn = () => {
      while(items.length) {
        inspectCount++;
        const item = items.shift();
        item.inspect(inspectOp);


        monkeyData[item.isDivisibleBy(testDiv) ? trueTarget : falseTarget].addItem(item);
      }
    }

    const addItem = (item) => items.push(item);

    return {
      takeTurn,
      addItem,
      getCount: () => inspectCount
    };
  };

  const monkeyData = input.map(getMonkey);

  for (let i = 0; i < 10000; ++i) {
    monkeyData.forEach(m => m.takeTurn());
  }

  const counts = monkeyData.map(m => m.getCount()).sort((a, b) => b - a);
  console.log(counts[0] * counts[1]);
}

main();