namespace C_
{
    using System;
    using System.Globalization;
    public class Program
    {
        public static void Main()
        {

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


            int sum  = 0;

            int originalNum = number;

            // WE ASSIGN THE ORIGINAL NUMBER'S VALUE TO A VARIABLE
            // BECASUE WE ARE GOING TO NEED IT LATER BUT THE ORIGINAL NUMBER'S
            //VALUE IS GOING TO BECHANGED

            while(number > 0) // IF THE NUMBER IS LESS THAN ZERO LOOP BREAKS;
            {
                int factorial = 1;

                int lastDigit = number % 10; // We GET THE LAST DIGIT OF THE NUMEBR

                for (int i = 1; i <= lastDigit; i++) // WE GET THE FACTORIAL HERE
                {
                    factorial *= i;
                }

                sum += factorial; // WE SUM THE FACTORIALS BECAUSE WE
                                 // WILL NEED TO CHECK IF THE SUM IS EQUAL
                                 // TO THE ORIGINAL NUMBER SO WE DETERMINE
                                 // WHETHER IT IS STROGN OR NOT

                number /= 10;  // THIS DIVISION IS DONE BECAUSE WE
                                // NEED TO REMOVE THE LAST DIGIT AFTER  EACH
                                // ITERATION

            }

            if(originalNum == sum)
            {
                Console.WriteLine("yes");
            }
            else
            {
                Console.WriteLine("no");
            }

        }


    }
}