using System;

public class Program

{

    public static void Main()

    {

        //var byteArray = new System.Collections.Generic.List<byte>(20000000);

        var byteArray = new byte[20000000];

        var sw = System.Diagnostics.Stopwatch.StartNew();

        var counter = 0;

        foreach( var item in byteArray )

            counter += item;

        Console.WriteLine(sw.Elapsed);

    }

}