Untitled

#include <iostream>
using namespace std;
int main() {
	int a, b, c;
	cin >> a;
	b = a;
	c = 0;
	while (b > 1){
		if (b >= 5) {
			c += b / 5 ;
			b -= b/5*5;
		}
		else if (b >= 4) {
			c += b / 4;
			b -= b/4*4;
		}
		else if (b >= 3) {
			c += b / 3;
			b -= b/3*3;
		}
		else if (b >= 2) {
			c += b / 2;
			b -= b/2*2;
		}
	}
	if (b == 1) c += 1;
	cout << c;

}