using System;

     namespace CSE1801013022

    {

       public class FarhanSakib

        {

           public static void Main(string[] args)

            {

                childclass ch = new childclass();

                ch.Total();

                Console.ReadLine();

            }

        }

    }

    abstract class baseclass

    {

        public int num = 7;

        public abstract void Total();   

    }

    class childclass : baseclass

    {

        public override void Total()

        {

            Console.WriteLine("Total Sum : " + num * num);

        }

    }