using System;

using System.Collections.Concurrent;

using System.Collections.Generic;

public class Program

{

    public static ConcurrentDictionary<int, string> kekMap = new ConcurrentDictionary<int, string>();

    public static void Main()

    {

        Console.WriteLine("Hello World");

        Program.Clear();

        Program.Add();

        var map = Program.Get();

        Console.WriteLine(map.Length);

        Program.Clear();

        Console.WriteLine(map.Length);

        Console.WriteLine(Program.kekMap.Count);

    }

    public static KeyValuePair<int, string>[] Get()

    {

        return kekMap.ToArray();

    }

    public static void Add()

    {

        Program.kekMap.TryAdd(1, "value1");

    }

    public static void Clear()

    {

        Program.kekMap.Clear();

    }

}