using System;

using System.Collections.Generic;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        List<AbstractFunction> functionList = new List<AbstractFunction>();

        functionList.Add(new GetCourtByDayClass());

        functionList.Add(new GetCourtByWeekClass());

        functionList[1].GetCourt(1);

        Console.ReadKey();

        Console.WriteLine("Hello World");

    }

}

​

abstract class AbstractFunction

{

    public abstract void GetCourt(int @value);

}

​

class GetCourtByDayClass : AbstractFunction

{

    public override void GetCourt(int day)

    {

        Console.WriteLine("Court 1, Court 2 and Court 3 are free.");

    }

}

​

class GetCourtByWeekClass : AbstractFunction

{

    public override void GetCourt(int week)

    {

        Console.WriteLine($"On Week {week} Court 5 and 6 are available");

    }

}