BOJ백준 2839 - 설탕 배달

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

 

BOJ/백준 2839 - 설탕 배달

 

n = int(input())
left_sugar = n % 5
cnt = int(n / 5)
​
if left_sugar == 0:
    print(cnt)
elif (left_sugar == 1) or (left_sugar == 3):
    print(cnt + 1)
elif left_sugar == 2:
    if cnt < 2:
        print(-1)
    else:
        print(cnt + 2)
elif left_sugar == 4:
    if cnt < 1:
        print(-1)
    else:
        print(cnt + 2)