TransportPrice1111

import java.util.Scanner;

public class P21_TransportPrice {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        int km = Integer.parseInt(scanner.nextLine());
        String part = scanner.nextLine();

        double taxistart = 0.7;
        double taxiday = 0.79;
        double taxinight = 0.90;
        double Bus = 0.09;
        double Train = 0.06;

        if (km < 20 && part.equals("day")) {
            System.out.println(taxistart + (km * taxiday));
        } else if (km < 20 && part.equals("night")) {
            System.out.println(taxistart + (km * taxinight));
        } else if (km >= 20 && km < 100) {
            System.out.println(km * Bus);
        } else {
            System.out.println(km * Train);
        }
    }
}