import java.util.Scanner;

public class PriceforTransport {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int Kmcount = Integer.parseInt(scanner.nextLine());
        String dayornight = (scanner.nextLine());

        double TaxiprizeStart = 0.70;
        double TaxiprizeDay = 0.79;
        double TaxiprizeNight = 0.90;
        double BusPrize = 0.09;
        double TrainPrize = 0.06;
        double DayTotalWithTaxi = TaxiprizeStart + Kmcount * TaxiprizeDay;
        double NightTotalWithTaxi = TaxiprizeStart + Kmcount * TaxiprizeNight;
        double TotalWithBus = Kmcount * BusPrize;
        double TotalWithTrain = Kmcount * TrainPrize;
        if ( Kmcount < 20 && dayornight.equalsIgnoreCase("day")){
            System.out.printf("%.2f", DayTotalWithTaxi);
        }
        else if ( Kmcount < 20 && dayornight.equalsIgnoreCase("night")){
            System.out.printf("%.2f", NightTotalWithTaxi);

        } else if (Kmcount >= 20 && Kmcount < 100 ){
            System.out.printf("%.2f", TotalWithBus);
        } else if (Kmcount > 100){
            System.out.printf("%.2f", TotalWithTrain);
        }




    }
}