Sudoku_Results

using System;

namespace Sudoku_Results
{
    class MainClass
    {
        public static void Main (string[] args)
        {
            TimeSpan TS = new TimeSpan ();

            int count_game = 0;
            int Second = 0;
            int Average_seconds = 0;
            string k = Console.ReadLine ();
            do {
                int mm = Convert.ToInt32(k.Substring (0, k.IndexOf(':')));
                int ss = Convert.ToInt32(k.Substring (k.IndexOf(':') + 1, 2));
                TimeSpan LTS = new TimeSpan(0,(int)mm,(int)ss);
                TS = TS.Add(LTS);
                k = Console.ReadLine ();
                count_game++;
            } while (k != "Quit");
            Average_seconds = Convert.ToInt32(Math.Ceiling(TS.TotalSeconds / count_game));

            if (Average_seconds < 720) {
                Console.WriteLine ("Gold Star");
            } else if (Average_seconds >= 720 && Average_seconds < 1440) {
                Console.WriteLine ("Silver Star");
            } else {
                Console.WriteLine ("Bronze Star");
            }

            Console.WriteLine ("Games - {0} \\ Average seconds - {1}", count_game, Average_seconds);
        }
    }
}