using System;
public class Hello{
    public static void Main(){
        
        long n = long.Parse(Console.ReadLine());
        long cnt = 0;
        
        cnt += (n / 15) * 4;
        cnt += (n / 5 - n / 15) * 2;
        cnt += (n / 3 - n / 15) * 2;

        Console.WriteLine(cnt);
    }
}