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

namespace lesson8
{
    class Program
    {
        static void Main(string[] args)
        {
            Room room1 = new Room();
            Console.WriteLine(Room.RoomCount + " " + room1.ID);
            Room room2 = new Room();
            Console.WriteLine(Room.RoomCount + " " + room2.ID);
            Room room3 = new Room();
            Console.WriteLine(Room.RoomCount + " " + room3.ID);
        }
    }

    class Room
    {
        public static int RoomCount = 0;
        public int ID;

        public Room()
        {
            ID = RoomCount;
            RoomCount++;
        }
    }
}