#include<stdio.h>
#include <vector>
#include <list>
#include <map>
#include <set>
#include <queue>
#include <stack>
#include <algorithm>
#include <sstream>
#include <iostream>
#include <string>
#include <stdio.h>

using namespace std;

int main() {

	long long N, cnt = 0;
	cin >> N;

	cnt = N / 5 + N / 3 - (N / 15) * 2;

	cout << cnt * 2 + (N / 15) * 4<< endl;

	return 0;
}