package com.company;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
	// write your code here
        Scanner s = new Scanner(System.in);
        long N = s.nextLong();
        System.out.println(4*N/15 + 2*(N/3 + N/5 - 2*N/15));
    }
}