using System;

class a

{

    public virtual  int count(int b){

        return b*10;

    }

​

}

    class m:a

    { 

        public  static int count(int b)

    {

    return b*20;

    }

    }

    class program{  

    public static void Main()

    {

        m obj =new a();

     Console.WriteLine("aa");

​

    }

    }

​