import java.util.Scanner;

public class WeddingInvestment {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String years = sc.nextLine();
        String type = sc.nextLine();
        String dessert = sc.nextLine();
        int months = Integer.parseInt(sc.nextLine());

        double total = 0;
        double totalSumForMonths = 0;

        switch (years) {
            case "one":
                if (type.equals("Small") && dessert.equals("yes")) {
                    total = 9.98 + 5.5;
                    totalSumForMonths = total * months;
                } else if (type.equals("Small") && dessert.equals("no")) {
                    total = 9.98;
                    totalSumForMonths = total * months;
                }

                if (type.equals("Middle") && dessert.equals("yes")) {
                    total = 18.99 + 4.35;
                    totalSumForMonths = total * months;
                } else if (type.equals("Middle") && dessert.equals("no")) {
                    total = 18.99;
                    totalSumForMonths = total * months;
                }

                if (type.equals("Large") && dessert.equals("yes")) {
                    total = 25.98 + 4.35;
                    totalSumForMonths = total * months;
                } else if (type.equals("Large") && dessert.equals("no")) {
                    total = 25.98;
                    totalSumForMonths = total * months;
                }

                if (type.equals("ExtraLarge") && dessert.equals("yes")) {
                    total = 35.99 + 3.85;
                    totalSumForMonths = total * months;
                } else if (type.equals("ExtraLarge") && dessert.equals("no")) {
                    total = 35.99;
                    totalSumForMonths = total * months;
                }
                break;

            case "two":
                if (type.equals("Small") && dessert.equals("yes")) {
                    total = (8.58 + 5.5);
                    totalSumForMonths = (total * months) - ((total * months) * (3.75 / 100));
                } else if (type.equals("Small") && dessert.equals("no")) {
                    total = 8.58;
                    totalSumForMonths = (total * months) - ((total * months) * (3.75 / 100));
                }

                if (type.equals("Middle") && dessert.equals("yes")) {
                    total = 17.09 + 4.35;
                    totalSumForMonths = (total * months) - ((total * months) * (3.75 / 100));
                } else if (type.equals("Middle") && dessert.equals("no")) {
                    total = 17.09;
                    totalSumForMonths = (total * months) - ((total * months) * (3.75 / 100));
                }

                if (type.equals("Large") && dessert.equals("yes")) {
                    total = 23.59 + 4.35;
                    totalSumForMonths = (total * months) - ((total * months) * (3.75 / 100));
                } else if (type.equals("Large") && dessert.equals("no")) {
                    total = 23.59;
                    totalSumForMonths = (total * months) - ((total * months) * (3.75 / 100));
                }

                if (type.equals("ExtraLarge") && dessert.equals("yes")) {
                    total = 31.79 + 3.85;
                    totalSumForMonths = (total * months) - ((total * months) * (3.75 / 100));
                } else if (type.equals("ExtraLarge") && dessert.equals("no")) {
                    total = 31.79;
                    totalSumForMonths = (total * months) - ((total * months) * (3.75 / 100));
                }
                break;
        }
        System.out.printf("%.2f lv.", totalSumForMonths);
    }
}