using System;

using System.Threading;

using System.Diagnostics;

​

public class Program

{

    public static long Time(Action action)

    {

        var stopWatch = Stopwatch.StartNew();

        action();

        return stopWatch.ElapsedMilliseconds;

    }

​

    public static void Main()

    {

        Console.WriteLine(Time(() => Thread.Sleep(100)));

    }

}