using System;

public class Program

{

    public static void Main(string[] args)

    {

        calculate calc = new calculate();

        numbers nmbr = new numbers();

        calc.addition();

        nmbr.addition();

        calc.subtraction();

        nmbr.subtraction();

    }

}

public class numbers

{

    public void addition()

    {

        Console.WriteLine("This is addition method");

    }

    public virtual void subtraction()

    {

        Console.WriteLine("This is subtraction method");

    }

}

public class calculate : numbers

{

    public new void addition()

    {

        Console.WriteLine("This is addition method in the derived class");

    }

    public override void subtraction()

    {

        Console.WriteLine("This is subtraction method override in derived class");

    }

}