function familyTrip(arg1, arg2, arg3, arg4) {
    let budget = Number(arg1);
    let nights = Number(arg2);
    let nightPrice = Number(arg3);
    let percent = Number(arg4);
    let price = 0;
    

    if (nights > 7) {
       price = nightPrice * 0.95;
    }

    percent = budget * 0.02;
    let totalMoney = nightPrice + percent;

    if (totalMoney >= budget) {
        console.log(`Ivanovi will be left with ${(totalMoney - budget).toFixed(2)} leva after vacation.`);
    } else if (totalMoney < budget) {
        console.log(`${(budget - totalMoney).toFixed(2)} leva needed.`);
    }
}

familyTrip("500", "7", "66", "15");