using System;

​

 class Shape

{

    public Shape(int n) => _side = n;

​

     private int _side;

    public  int GetVolume()=> _side*GetArea();

    public  int GetArea()=> _side * _side;

}

​

class Square : Shape

{

    // GetArea method which needs to be overridden .

    public  int GetArea() => (_side/2) * (2*_side);

​

    public static void Main()

    {

        var sq = new Square(12);

        Console.WriteLine($"Area of the square = {sq.GetVolume()}");

    }

}

// Output: Area of the square = 144