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

namespace ConsoleApplication14
{
    class Program
    {
        static void Main(string[] args)
        {
            int confirm = 0, notconfirm = 0;

            Random rnd = new Random();

            List<Tuple<bool, bool, bool>> p = new List<Tuple<bool, bool, bool>>();

            for (int i = 0; i < 500000; i++)
            {
                //var t = new Tuple<bool, bool, bool>(rnd.Next(2) == 1 ? true : false, rnd.Next(2) == 1 ? true : false, rnd.Next(2) == 1 ? true : false);
                //p.Add(t);

                var t1 = new Tuple<bool, bool, bool>(false, false, true);
                var t2 = new Tuple<bool, bool, bool>(false, true, false);
                var t3 = new Tuple<bool, bool, bool>(false, true, true);
                var t4 = new Tuple<bool, bool, bool>(true, false, false);
                var t5 = new Tuple<bool, bool, bool>(true, false, true);
                var t6 = new Tuple<bool, bool, bool>(true, true, false);

                switch (rnd.Next(6))
                {
                    case 0:
                        p.Add(t1);
                        break;
                    case 1:
                        p.Add(t2);
                        break;
                    case 2:
                        p.Add(t3);
                        break;
                    case 3:
                        p.Add(t4);
                        break;
                    case 4:
                        p.Add(t5);
                        break;
                    case 5:
                        p.Add(t6);
                        break;
                    default:
                        throw new Exception("second error");
                }


            }

            for (int i = 0; i < 500000; i++)
            {
                var t = p[i];
                bool first, second;
                switch (rnd.Next(3))
                {
                    case 0:
                        first = t.Item1;
                        break;
                    case 1:
                        first = t.Item2;
                        break;
                    case 2:
                        first = t.Item3;
                        break;
                    default:
                        throw new Exception("first error");

                }

                switch (rnd.Next(3))
                {
                    case 0:
                        second = !t.Item1;
                        break;
                    case 1:
                        second = !t.Item2;
                        break;
                    case 2:
                        second = !t.Item3;
                        break;
                    default:
                        throw new Exception("second error");
                }

                if (first != second)
                    confirm++;
                else
                    notconfirm++;
            }

            Console.WriteLine((double)confirm / (double)(confirm + notconfirm));
            Console.ReadKey();
        }
    }
}