백준 2839: 설탕 배달 (Python)

https://www.acmicpc.net/problem/2839

2839번: 설탕 배달

 

n = int(input())
res = 0
k = n
cnt = 0

while res == 0:
    if k % 5 == 0:
        res = k // 5 + cnt
    else:
        k -= 3
        cnt += 1

    if k == 0:
        res = n // 3

    if k < 0:
        res = -1

print(res)

 

n = int(input())
res = 0

while True:
    if n % 5 == 0:
        res += n // 5
        break
    else:
        n -= 3
        res += 1

    if n < 0:
        res = -1
        break

print(res)