using System;

namespace TransportPrice
{
    class Program
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());
            string dayOrNight = Console.ReadLine();

            if (n < 20 && dayOrNight == "day")
            {
                double taxiDay = (0.70 + n * 0.79);
                Console.WriteLine(taxiDay);
            }

            else if (n < 20 && dayOrNight == "night")
            {
                double taxiNight = 0.70 + n * 0.90;
                Console.WriteLine($"{taxiNight:F2}");
            }
            else if (n >= 20 && n < 100)
            {
                double bussDayNight = 0.09;
                Console.WriteLine($"{bussDayNight * n:F2}");
            }
            else
            {
                double trainDayNight = 0.06;
                Console.WriteLine($"{trainDayNight * n:F2}");
            }
        }
    }
}