using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

    }

}

​

static class Shoppinglist

{

    static List<Article> items = new List<Article>();

    static void AddItem(string nameOfArticle)

    {

    }

    static void AddItem(string nameOfArticle, int amount)

    {

    }

}

​

class Article

{

    private string name;

    private int amount;

    private static int totalAmount;

​

    public Article(string name)

    {

        this.name = name;

        amount = 1;

        totalAmount++;

    }

    public Article(string name, int amount)

    {

        this.name = name;

        this.amount = amount;

        totalAmount += amount;

    }

}