#include<iostream>
#include<string>
#include<algorithm>
#include<cmath>
#include<iomanip>
#include<cstring>
#include<map>
#include<vector>
#include<queue>
using namespace std;
typedef long long int ll;

int main(){

	ll n;
	cin >> n;
	cout << 4*(n/15)+2*(n/3-n/15)+2*(n/5-n/15) << endl;
  
  return 0;
}