using System;


public class Program
{
    public static void Main()
    {
        int num = int.Parse(Console.ReadLine());
        int a = num;
        int b = num;
        int counter = 0;
        while (true)
        {
            a /= 10;
            counter++;
            if (a == 0)
            {
                break;
            }
        }
        int sum = 1;
        int counterA = 0;
        for (int i = 0; i < counter; i++)
        {
            int diget = num % 10;
            counterA++;
            for (int j = 1; j <= diget; j++)
            {
                sum *= j;
            }
            num /= 10;
        }
        if (sum == b)
        {
            Console.WriteLine("yes");
        }
        else
        {
            Console.WriteLine("no");
        }
    }
}