using System;

namespace _06StrongNumber
{
    class Program
    {
        static void Main(string[] args)
        {
            int number = int.Parse(Console.ReadLine());
            string factorial = number.ToString();
            int sum = 0;
            int sum1 = 1;





          for (int i = 0; i < factorial.Length; i++)
            {
             int currentNumber = 0;
             int.TryParse(factorial[i].ToString(), out currentNumber);


                for (int y = 1; y <= currentNumber; y++)
                {
                    sum1 = sum1 * y;
                }
                sum += sum1;
                sum1 = 1;
            }
            if (sum == number)
            {
                Console.WriteLine("yes");
            }
            else
            {
                Console.WriteLine("no");
            }
        }
    }
}