using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        Console.Write("Km: ");

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

        Console.Write("Day Or Night =");

        string dayOrNight = Console.ReadLine();

        double taxiRate = 0;

        double price = 0;

        if (dayOrNight == "day")

            taxiRate = 0.79;

        else

            taxiRate = 0.90;

        if (n<20)

            price = 0.70 + taxiRate * n;

        else if (n<100)

            price = n * 0.09;

        else

            price = n * 0.06;

        Console.WriteLine("Цената за транспорт е {0}.", price);

    }

}