using System;

public class Program

{

    public static void Main()

    {

        BaseTwo t = new ChildB();

        Console.WriteLine(t.DoAnotherThing(3));

    }

}

​

public class BaseOne

{

    public virtual int DoSomeThing(int a) {

        return a * 2; 

    }

}

​

public class BaseTwo {

    public int DoAnotherThing(int a) {

        return a * 3; 

    }

}

​

public class ChildA : BaseOne 

{

    public override int DoSomeThing(int a) 

    {

        return a + 24;

    }

}

​

public class ChildB : BaseTwo

{

    public new int DoAnotherThing(int a) 

    {

        return a - 1;

    }

}