01. Back To The Past

function solve(moneyFortune, yearLive) {
    moneyFortune = Number(moneyFortune);
    yearLive = Number(yearLive);
    let yearBack = 1800;
    let spendEvYear = 12000;
    let countEven = 0;
    let countOdd = 0;

    for (let i = yearLive; i >= yearBack; i--) {
        if (i % 2 === 0) {
            countEven++;
        } else {
            countOdd++;
        }
    }
    let curnetYears = yearLive - yearBack + 18 - countOdd;
    let spendOddYear = (12000 + (50 * curnetYears));
    let spendA = (moneyFortune - ((countEven * spendEvYear) + (countOdd * spendOddYear)));
    let spend = Math.abs(spendA.toFixed(2));
    if (spendA >= 0) {
        console.log(`Yes! He will live a carefree life and will have ${spend} dollars left.`);
    } else {
        console.log(`He will need ${spend} dollars to survive.`);
    }


}
//solve(50000, 1802);
solve(100000.15,1808);