Rice bags

You deliver exactly n kg of rice in 3 kg bags and 5 kg bags. You may use any number of each kind, including none of one kind. Complete the function solution, which returns the smallest number of bags you can use.

If you cannot make exactly n kg, return -1.

Function

solution(n)

Constraints

• n is an integer from 1 to 1,000,000,000.

Examples

Starter code

def solution(n):
    answer = -1
    return answer