function solve(budget, finalYear) {
    budget = +budget;
    finalYear = +finalYear;

    let age = 17;
    let spendings1 = 0;
    let spendings2 = 0;

    for (let i = 1800; i <= finalYear; i++) {
        age ++;
        if (i % 2 === 0) {
            spendings1 += 12000;
        } else {
            spendings2 += 12000 + (50 * age);
        }
    }

    let totalspendings = spendings1 + spendings2;
    let difference = Math.abs(totalspendings - budget).toFixed(2);

    if (totalspendings <= budget) {
        console.log(`Yes! He will live a carefree life and will have ${difference} dollars left.`);
    } else {
        console.log(`He will need ${difference} dollars to survive.`);

    }
}

solve(
    "100000.15",
    "1808"
    );