using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

    }

    abstract class MyConf<T> where T : IEntity<T> {}

    interface IEntity<T> {}

    class MyEntity : IEntity<MyEntity> {}

    //class SmthConf<T> : MyConf<T> where T : IEntity<T> {}

}