using System;

public class Pyramid{

    public double v,B,H;

    public Pyramid()

    {}

    public Pyramid(double b,double h)

    {

        B = b;

        H = h;

    }

    public virtual void volume(){

        v = (B * H)/3;

        Console.WriteLine("Volume of Pyramid = "+v);

    }

}

public class prism : Pyramid{

    public double vol,_base,height;

    public prism()

    {}

    public prism(double b,double h)

    {

        _base = b;

        height = h;

    }

public override void volume(){

    vol =  _base * height;

    Console.WriteLine("Volume of Prism = "+vol);

}

}

public class Cube : Pyramid{

    public double vol,cubes;

    public Cube()

    {}

    public Cube(double cube)

    {

        cubes = cube;

    }

public override void volume(){

    vol = cubes *cubes*cubes;

    Console.WriteLine("Volume of Cube = "+vol);

}

}

public class Program

{

    public static void Main()

    {

        Pyramid obj2 = new Pyramid(16,8);

        prism obj1 = new prism(9,5);

        Cube obj3 = new Cube(3);

        obj1.volume();

        obj2.volume();

        obj3.volume();

    }

}