using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Въведи K");

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

        int k1=0;

        int pro = 1;

​

        while(k>0)

        {

            k1=k%10;

            pro=pro*k1;

            k=k/10; 

        }

        Console.WriteLine(pro);

    }

}