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);
        int count = 0;
        int N = s.nextInt();
        for (int i = 1; i < N + 1; i++) {
            if (i % 3 == 0 && i % 5 == 0) {
                count = count + 4;
            } else if (i % 3 == 0 || i % 5 == 0) {
                count = count + 2;
            }
        }
        System.out.println(count);
    }
}