using System;

public class Program

{

    public static void Main()

    {

    int  x,y;

        Console.WriteLine("enter tow numbers");

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

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

        if (x>0 && x%2==0)

            Console.WriteLine(x*10+y);

        if (y>0 && y%4==0)

            Console.WriteLine((y-10)*x);

        if(x<0 || y<0)

            Console.WriteLine("invalid number !!!!");

​

​

    }

}