import java.util.*;

public class NotFound {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String[] input = scanner.next().split("");
        if(input[0].equals("4") || input[0].equals("5")) {
            System.out.println("Yes");
        } else {
            System.out.println("No");
        }
    }
}