import java.util.Scanner;

public class P03_MobileOperator {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);

        String period = scan.nextLine();
        String type = scan.nextLine();
        String internet = scan.nextLine();
        int mothsToPay = Integer.parseInt(scan.nextLine());

        double price = 0.0;

        if ("one".equals(period)) {
            switch (type) {
                case "Small":
                    price = 9.98;
                    break;
                case "Middle":
                    price = 18.99;
                    break;
                case "Large":
                    price = 25.98;
                    break;
                case "ExtraLarge":
                    price = 35.99;
                    break;
            }
        } else if ("two".equals(period)) {
            switch (type) {
                case "Small":
                    price = 8.58;
                    break;
                case "Middle":
                    price = 17.09;
                    break;
                case "Large":
                    price = 23.59;
                    break;
                case "ExtraLarge":
                    price = 31.79;
                    break;
            }
        }
        if ("yes".equals(internet)) {
            if (price <= 10) {
                price += 5.50;
            } else if (price <= 30) {
                price += 4.35;
            } else {
                price += 3.85;
            }
        }

        price *= mothsToPay;

        if ("two".equals(period)) {
            price -= price * 0.0375;
        }

        System.out.println(String.format("%.2f lv.", price));
    }
}