#include <iostream>

int main()
{
  float N;
  std::cin >> N;
  
  int z_count = 0;
  for(int i=1;i<=N;i++){
    if(i % 15 == 0){
      z_count += 4;
    }else if((i%5==0) || (i%3==0)){
      z_count += 2;
    }
  }

  std::cout << z_count << std::endl;
  
  return 0;
}