using System;

public class Program

{

    public static void Main()

    {

        {

            Console.Write("DO you want to enter car?(y/n)");

            char first = char.Parse(Console.ReadLine());

            if(first == 'y')

            {

                do

                {

                    Console.Write("Enter car licens plate");

                    string license = string.Intern(Console.ReadLine());

                    Console.Write("Enter number of hour parked");

                    int hour = int.Parse(Console.ReadLine());

                    int thour = hour * 20;

                    int vthour = (thour * 10)/100;

                    if(hour > 0)

                        Console.WriteLine("You need to pay for this car {0} Bath",thour);

                    else if (hour >= 4)

                        Console.WriteLine("We have discount 10% so you need to pay for this car {0} Bath",vthour);

                    Console.WriteLine("DO you want to enter another car?(y/n)");

                    char ans = char.Parse(Console.ReadLine());

                }while(true);

            }

            else

                Console.WriteLine("Then bye");

        }

    }

}