using System;

​

using System.Collections.Generic;

​

public delegate void delegatetest(int p);

​

public class Program

{

    public static void Main()

    {

        delegatetest a = new delegatetest(delegate (int arg) { Console.WriteLine("A " + arg); });

        a(1);

        delegatetest b = arg => Console.WriteLine("B " + arg);

        b(2);

        delegatetest c = delegate (int arg) { Console.WriteLine("C " + arg); };

        c(3);

        delegatetest d = new delegatetest(arg => Console.WriteLine("D " + arg));

        d(4);

        delegatetest e = arg => {};

        e += a;

        e += b;

        e += c;

        e += d;

        e(5);

        delegatetest f = new(e);

        f(6);

    }

}