Teo

using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Numerics;
using System.Text;
using System.Threading.Tasks;
using System.Threading;

namespace Test
{
    class ThreeEqualNumber
    {
        static void Main()
        {
            string format;
            TimeSpan timeInterval = new TimeSpan(0 , 0 , 0);
            TimeSpan timeSum = new TimeSpan(0 , 0 , 0);

            //CultureInfo culture;
            //culture = CultureInfo.InvariantCulture;
            //Thread.CurrentThread.CurrentCulture = CultureInfo.InvariantCulture;
            format = "mm\\:ss";
            string command = Console.ReadLine();
            int counter = 1;

            while(command != "Quit")
            {
                timeInterval = TimeSpan.ParseExact(command , format , null);
                timeSum += timeInterval;
                counter++;
                command = Console.ReadLine();
            }

            bool isGold = ( timeSum.TotalSeconds ) / counter < 720;

            if(isGold)
            {
                Console.WriteLine("Gold Star");
                Console.WriteLine("Games - {0} \\ Average seconds - {1}" , counter , Math.Ceiling(timeSum.TotalSeconds / counter));
            }

            else if(timeSum.TotalSeconds / counter > 720 && timeSum.TotalSeconds / counter < 1440)
            {
                Console.WriteLine("Silver Star");
                Console.WriteLine("Games - {0} \\ Average seconds - {1}" , counter , Math.Ceiling(timeSum.TotalSeconds / counter));
            }
            else
            {
                Console.WriteLine("Bronze Star");
                Console.WriteLine("Games - {0} \\ Average seconds - {1}" , counter , Math.Ceiling(timeInterval.TotalSeconds / counter));
            }
        }
    }
}