Problem

Code

function solution(price, money, count) {
    let priceSum = 0;
    for (let i=1; i<count+1; i++) {
        priceSum += price * i;
        if (i === count) {
            let shortOfAmount = money - priceSum;
            shortOfAmount<0 ? -shortOfAmount : 
            if (shortOfAmount < 0) {
                return -(shortOfAmount);
            } else {
                return 0;
            }
        }
    }
}