using System;

namespace StrongNumber

{

    class Program

    {

        static void Main(string[] args)

        {

            int number = int.Parse(Console.ReadLine());//6921

            string lenght = number.ToString();

            int sum = 0;

            for (int digitsCount = 0; digitsCount < lenght.Length; digitsCount++)

            {

                int currentFactorial = (int)(lenght.ToString()[digitsCount]) - 48;

                int currentSum = 1;

                for (int count = currentFactorial; count >= 1; count--)

                {

                    currentSum *= count;

                }

                sum = sum + currentSum;

            }

            if (sum == number)

            {

                Console.WriteLine("yes");

            }

            else

            {

                Console.WriteLine("no");

            }

        }

    }

}