#include<iostream>
#include<algorithm>
#include<stdio.h>
#include<stdlib.h>
#include<vector>
#include<string>
#include<sstream>
using namespace std;


int main(){

  long long int n;
  cin >> n;

  long long int cnt=0;

  long long int tmp = n/15;
  cnt += tmp*4;
  cnt += (n/3-tmp)*2;
  cnt += (n/5-tmp)*2;

  cout << cnt << endl;

  return 0;
}