using System;

public class Program

{

    public static void Main()

    {

        string[] arr = {"2", "3", "4", "5", "6", "7", "8", "9", "10", "J", "Q", "K", "A"};

        bool isEqual = false;

        string input = Console.ReadLine();

​

        for (int i = 0; i < arr.Length; i++)

        {

            if (arr[i] == input)isEqual = true;

        }

​

        Console.WriteLine(isEqual ? "yes" : "no");  }

}