#include <iostream>
using namespace std;

int main(){
	int n;
	cin >> n;
	int count = 0;
	for(int i = 0; i < n; i++){
		if(i % 15 == 0) count += 4;
		else if(i % 3 == 0 or i % 5 == 0) count += 2;
	}
	cout << count << endl;
	return 0;
}