const fs = require('fs');

let input = fs.readFileSync(__dirname + '/input.txt', 'utf8');

let result = 0;

const expressions: Array<RegExpMatchArray> = Array.from(input.matchAll(/(do(n't)?)\(\)|mul\((\d{1,3}),(\d{1,3})\)/g));

let enabled = true;

expressions.forEach((match) => {
    const expr = match[0];

    // Part 2
    if (expr.startsWith('do(')) {
        enabled = true;
        return;
    }
    if (expr.startsWith('don\'t(')) {
        enabled = false;
        return
    }
    // End part 2
    if (enabled) {
        result += (parseInt(match[3]) * parseInt(match[4]));
    }
});

console.log(result);