using System;

public class Program

{

    public static void Main()

    {

        var time = DateTime.Now;

        Console.WriteLine(time);

        if(time.Minute < 10 || time.Minute > 40)

        {

            System.TimeSpan ts = new System.TimeSpan(time.Hour, 10, 0);

            var s = time.Minute - ts.Minutes;

            Console.WriteLine(s);

        }

        else

        {

            System.TimeSpan ts2 = new System.TimeSpan(time.Hour, 40, 0);

            Console.WriteLine((time.Minute - ts2.Minutes));

        }

    }

}