01. Bitcoin Mining js exam

function solve(args) {
  const bitcoin = 11949.16;
  const gold = 67.51;
  let totalSum = 0;
  let day = 0;
  let firstDay = 0;
  let boughtBitcoin = 0;
  let countBitcoin = 0;
  let sumBitcoins = 0;


  args.forEach((element) => {
    day++;
    if (day % 3 === 0) {
      element *= 0.7;
    }

    const singleDayEarning = element * gold;
    totalSum += singleDayEarning;


    if (totalSum >= bitcoin) {
      countBitcoin++;
      boughtBitcoin = Math.floor(totalSum / bitcoin);
      totalSum -= (bitcoin * boughtBitcoin);
      sumBitcoins += boughtBitcoin;
    }
    if (countBitcoin === 1) {
      firstDay = day;
    }
  });

  console.log(`Bought bitcoins: ${sumBitcoins}`);
  if (firstDay !== 0) {
    console.log(`Day of the first purchased bitcoin: ${firstDay}`);
  }
  console.log(`Left money: ${totalSum.toFixed(2)} lv.`);
}