using System;

​

public class Program

{

    public static void Main(string[] args)

    {

        Derive newD = new Derive();

        newD.N();

    }

}

public class Base

{

    public virtual void M()

    {

        Console.Write("Base version of M");

    }

​

    public void N()

    {

        M();

    }

}

​

public class Derive : Base

{

    public override void M()

    {

        Console.Write("Overrided version of M");

    }

}