[백준 2839번] 설탕 배달 - Python

문제

 

 

소스 코드

 

n = int(input())
remain = n % 5
if n is 4 or n is 7:
    print(-1)
elif remain is 0:
    print(n//5)
elif remain is 1:
    print((n-6)//5 + 2)
elif remain is 2:
    print((n-10)//5 + 4)
elif remain is 3:
    print(n//5+1)
elif remain is 4:
    print((n-9)//5 + 3)