#include <iostream>
#include <cstring>
using namespace std;

int main(){
	int n;
	cin >> n;
	int FizzBuzz = n/15;
	int Fizz = n/3 - FizzBuzz;
	int Buzz = n/5 - FizzBuzz;

	cout << (Fizz+Buzz)*2 + FizzBuzz*4 << endl;

}