using System;

namespace _10.SkiTrip
{
    class SkiTrip
    {
        static void Main(string[] args)
        {
            int days = int.Parse(Console.ReadLine());
            string roomType = Console.ReadLine();
            string feedback = Console.ReadLine();

            int nights = days - 1;

            double sumNights = 0;

            if (roomType == "room for one person")
            {
                sumNights = 18 * nights;
            }
            else if ( roomType == "apartment")
            {
                if (nights < 10)
                {
                    sumNights = (25 * nights) * 0.7;
                }
                else if (nights >= 10 && nights <= 15)
                {
                    sumNights = (25 * nights) * 0.65;
                }
                else if (nights > 15)
                {
                    sumNights = (25 * nights) * 0.5;
                }
            }
            else if (roomType == "president apartment")
            {
                if (nights < 10)
                {
                    sumNights = (35 * nights) * 0.9;
                }
                else if (nights >= 10 && nights <= 15)
                {
                    sumNights = (35 * nights) * 0.85;
                }
                else if (nights > 15)
                {
                    sumNights = (35 * nights) * 0.8;
                }
            }

            if (feedback == "positive")
            {
                sumNights = sumNights * 1.25;  // *=
            }
            else if (feedback == "negative")
            {
                sumNights = sumNights * 0.9;
            }

            Console.WriteLine($"{sumNights:f2}");

        }
    }
}