import java.util.*; public class Main { public static void main(String[] args) { Scanner sc = new Scanner(System.in); int n = sc.nextInt(); int ans = 0; for(int i = 1; i <= n; i++) { if(i % 3 == 0 && i % 5 == 0) { ans += 4; } else if(i % 3 == 0 || i % 5 == 0) { ans += 2; } } System.out.println(ans); } }