#include<iostream>
using namespace std;
int main(){
  int N, z_cnt = 0;
  cin >> N;
  for(int i = 1; i <= N; i++){
    if(i % 15 == 0) z_cnt += 4;
    else if(i % 3 == 0) z_cnt += 2;
    else if(i % 5 == 0) z_cnt += 2;
  }
  cout << z_cnt;
}
//わざわざStringを持ち出さない