using System.Diagnostics;

using System.Collections.Concurrent;

using System;

​

public class Program

{

    public static void Main()

    {

        ConcurrentStack<int> t = new();

        t.PushRange(new int[] {1,2,3,4,5,6,7,8});

        int a;

        Stopwatch st = Stopwatch.StartNew(); 

        Console.WriteLine($"count {t.Count}");

        t.TryPop(out a);

        st.Stop();

        Console.WriteLine(st.Elapsed.Milliseconds );

    }

}