[Level 1] / [Python] 부족한 금액 계산하기

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

프로그래머스

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def solution(price, money, count):
    answer = price
    for i in range(2, count+1):
        answer += price * i
    return answer-money if answer-money >= 0 else 0