Lv.1_부족한 금액 계산하기

https://school.programmers.co.kr/learn/courses/30/lessons/82612

프로그래머스

def solution(price, money, count):
    total = 0
    
    for i in range(1, count + 1):
        total = total + price * i
    
    return abs(money - total) if money < total else 0

절댓값은 abs