using System;

public class Program

{

    public static void Main()

    {var hello = () => Console.WriteLine("016");

var message = () => Console.Write("Hello ");

message += () => Console.WriteLine("World"); 

message += hello;   

message += Print;   

message();

Console.WriteLine("--------------"); 

message -= Print;   

message -= hello;  

message?.Invoke();  

void Print() => Console.WriteLine("Welcome to C#");

        Console.WriteLine("Hello World");

    }

}