#include <iostream>
using namespace std;

int main() {
	int n,cnt=0;
	cin >> n;
	for(int i=1;i<=n;i++){
		if(n%15==0)
			cnt += 4;
		else if(n%3==0 || n%5==0)
			cnt += 2;
	}
	cout << cnt << endl;
}