import java.util.Scanner;

public class SkiTrip {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        int days = Integer.parseInt(scanner.nextLine());
        String room = scanner.nextLine();
        String rating = scanner.nextLine();

        double priceOne = 18.00;
        double priceTwo = 25.00;
        double priceThree = 35.00;

        double price = 0.00;

        double nights = days - 1;

        if (room.equals("room for one person")) {
            if (nights < 10) {
                price = priceOne * nights;
            } else if (nights <= 15) {
                price = priceOne * nights;
            } else {
                price = priceOne * nights;
            }
        } else if (room.equals("apartment")) {
            if (nights < 10) {
                price = priceTwo * nights * 0.70;
            } else if (nights <= 15) {
                price = priceTwo * nights * 0.65;
            } else {
                price = priceTwo * nights * 0.50;
            }
        } else if (room.equals("president apartment")) {
            if (nights < 10) {
                price = priceThree * nights * 0.90;
            } else if (nights <= 15) {
                price = priceThree * nights * 0.85;
            } else {
                price = priceThree * nights * 0.80;
            }
        }

        if (rating.equals("positive")) {
            price = price + (0.25 * price);
        } else if (rating.equals("negative")) {
            price = price - (0.10 * price);
        }

            System.out.printf("%.2f", price);
    }
}