using System;

namespace ConsoleApp2
{
    class Program
    {
        static void Main(string[] args)
        {
            string number = Console.ReadLine();
            int total = 0;
            int sum = 0;

            for (int i = 0; i <= number.Length; i++)
            {
                char current  = number[i];

                int num = ((int)current);

                for (int j = 1; j <=num; j++)
                {
                    sum *= j;

                }
                total += sum;

            }


            int stringToNum = int.Parse(number);
            if (stringToNum == total)
            { Console.WriteLine("yes"); }
            else { Console.WriteLine("no"); }
        }
    }
}