using System;

using System.Collections.Generic;

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

    }

}

​

public class Project

{

    public Project()

    {

        this.Documents = new List<Document>();

    }

​

    public string Name

    {

        get;

        set;

    }

​

    public DateTime CreationDate

    {

        get;

        set;

    }

​

    public List<Document> Documents

    {

        get;

        private set;

    }

}

​

public class Document

{

    public Document()

    {

        this.Authors = new List<Author>();

    }

​

    public string Title

    {

        get;

        set;

    }

​

    public string FilePath

    {

        get;

        set;

    }

​

    public List<Author> Authors

    {

        get;

        private set;

    }

}