function calcTotalPrice(price, count) {
  let result = 0;
  for (let i = 1; i <= count; i++) {
    result += price * i;
  }
  return result;
}

function solution(price, money, count) {
  const totalPrice = calcTotalPrice(price, count);
  return totalPrice - money > 0 ? totalPrice - money : 0;
}

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