import java.util.Scanner;

public class FuelTank_09 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String fuel = scanner.nextLine();
        double liters = Double.parseDouble(scanner.nextLine());
        String discount = scanner.nextLine();
        double pricePerLiter = 0;
        double totalPrice = 0;

        switch (fuel) {
            case "Gas":
                if (discount.equals("Yes")) {
                    pricePerLiter = 0.93 - 0.08;
                } else if (discount.equals("No")) {
                    pricePerLiter = 0.93;
                }
                if (liters <= 20) {
                    totalPrice = liters * pricePerLiter;
                } else if (liters > 20 && liters <= 25) {
                    totalPrice = liters * pricePerLiter * 0.92;
                } else if (liters > 25) {
                    totalPrice = liters * pricePerLiter * 0.9;
                }
                break;
            case "Gasoline":
                if (discount.equals("Yes")) {
                    pricePerLiter = 2.22 - 0.1;
                } else if (discount.equals("No")) {
                    pricePerLiter = 2.22;
                }
                if (liters <= 20) {
                    totalPrice = liters * pricePerLiter;
                } else if (liters > 20 && liters <= 25) {
                    totalPrice = liters * pricePerLiter * 0.92;
                } else if (liters > 25) {
                    totalPrice = liters * pricePerLiter * 0.9;
                }
                break;
            case "Diesel":
                if (discount.equals("Yes")) {
                    pricePerLiter = 2.33 - 0.08;
                } else if (discount.equals("No")) {
                    pricePerLiter = 2.33;
                }
                if (liters <= 20) {
                    totalPrice = liters * pricePerLiter;
                } else if (liters > 20 && liters <= 25) {
                    totalPrice = liters * pricePerLiter * 0.92;
                } else if (liters > 25) {
                    totalPrice = liters * pricePerLiter * 0.9;
                }
                break;
        }

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