package yuki_coder;

import java.util.Scanner;

public class No_311 {
public static void main(String[] args) {
	Scanner sc = new Scanner(System.in);
	long N = sc.nextLong();
	long ans = 0;
	for(int i = 1; i <= N; i++){
		if(i%15==0){
			ans += 4;
		}else if(i%3==0){
			ans += 2;
		}else if(i%5==0){
			ans += 2;
		}
	}
	System.out.println(ans);
}
}