using System;

public class Program

{

    public static void Main()

    {

        DateTime start = DateTime.Now;

        DateTime end = DateTime.Now.AddHours(16).AddMinutes(24).AddSeconds(24).AddMilliseconds(402);

        TimeSpan span = end - start;

        var hours = span.TotalMilliseconds /60/60/1000;

        Console.WriteLine(hours);

    }

}