using System;

namespace Transport_Price
{
    class Program
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());
            string dayOrNight = Console.ReadLine().ToString();
            double taxi = 0.70;
            double bus = 0.09;
            double train = 0.06;
            double taxiday = 0.79;
            double taxiNight = 0.90;
            if (n <= 20 && dayOrNight == "day")          // taxi
            {

                Console.WriteLine($"{taxi + (n * taxiday):f2}");
            }
            else if (n <= 20 && dayOrNight == "night")
            {

                Console.WriteLine($"{((n * taxiNight) + taxi):f2}");
            }
            else if (n >= 20 && dayOrNight == "day")
            {

                Console.WriteLine($"{(n * bus):f2}");
            }
            else if (n >= 100)
            {

                Console.WriteLine($"{(n * train):f2}");
            }
            else
            {
                Console.WriteLine("Invalid");
            }

        }
    }
}