using System;

public class Program

{

    public static void Main()

    {

        var test = "WHAT?";

        Console.WriteLine($"Hello World {test}");

        Console.WriteLine($$"""Hello World {test}""");

        Console.WriteLine($$"""Hello World {{test}}""");

        Console.WriteLine($$$"""Hello World { {{test}} }""");

        Console.WriteLine($$$"""Hello World { {{{test}}} }""");

    }

}