using System;

using System.Linq;

using System.Collections.Generic;

public class Program

{

    class Car

    {

        private static int counter = 0;

        private static Random random=new Random();

        public string RegNumber{get; set;}

        public int ArrivalTime{get; set;}

        public int ParkingTime{get; set;}

        public Car()

    {

        counter++;

        RegNumber=$"BG{counter:000}";

        ArrivalTime=DateTime.Now.Hour;

        ParkingTime=random.Next(30,120);

    }

    }

    public static void Main()

    {

        Queue<Car> cars=new Queue<Car>();

        int capacity=10;

        while(true)

        {

            string input=Console.ReadLine();

            if(input == "exit")

            {

                break;

            }

            else if(input=="add")

            {

                if(freeSpace>0)

                {

                    Car newCar=new Car();

                    cars.Enqueue(newCar);

                    freeSpace--;

                    Console.WriteLine("car with red number:{0} has added to parking at {1} ",newCar.RegNumber,newCar.ArrivalTime);

                }

                else

                {

                    Console.WriteLine("no free spaces! ");

                }

            }

            else if(input=="remove")

            {

                if(cars.Count==0)

                {

                    Console.WriteLine("No cars");

                }

                else

                {

                    Car removedCar=cars.Dequeue();

                    freeSpace++;

                    Console.WriteLine("car with regN {0} has removed from parking for {1} parking",);

                }

            }

            else if(input=="count")

            {

                Console.WriteLine("the count of cars is :{0}",cars.Count);

                Console.WriteLine("free spaces count is:{0}",freeSpace);

            }

            else

            {

                Console.WriteLine("invalid command");

            }

        }

    }

}