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

const sum = (arr) => arr.reduce((total, num) => total+num, 0);


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

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

    const testItem = (item) => !(item % rows[2].split(" ")[2]);
    const items = rows[0].split(", ").map(x => parseFloat(x));
    const inspectItem = (old) =>  Math.floor(eval(`const old = ${old}; const item${rows[1]}; itemnew;`)/3);

    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();
        const inspectedItem = inspectItem(item);

        monkeyData[testItem(inspectedItem) ? trueTarget : falseTarget].addItem(inspectedItem);
      }
    }

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

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

  const monkeyData = input.map(getMonkey);

  for (let i = 0; i < 20; ++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();