#define _GLIBCXX_DEBUG
#define ll long long
#include <bits/stdc++.h>
using namespace std;

int main() {
  ll N; cin >> N;
  ll ans = 0;
  if(N >= 15){
    ans += (N/15)*16;
    N %= 15;
  }
  for(int i = 1; i <= N; i++){
    if(N%3 == 0 or N%5 == 0) ans++;
  }
  cout << ans << endl;
}