알고리즘 [백준:2839]실버

#include<iostream>
using namespace std;


int SugarSalt()
{
	int data = 0,answer=0;
	cin >> data;

	while (data!=0)
	{
		if (data % 5 == 0) {
			data -= 5;
			answer++;
		}
		else if (data - 3 >= 0) {
			data -= 3;
			answer++;
		}
		else {
			answer = -1;
			break;
		}
	}
	return answer;
}
int main() {
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	cin.tie(NULL);
	cout<<SugarSalt();

	return 0;
}