import java.util.Scanner;

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

        String product = scanner.nextLine().toLowerCase();
        String day = scanner.nextLine().toLowerCase();
        double quantity = Double.parseDouble(scanner.nextLine());
        double price = 0;

        boolean Weekdays = day.equals("monday") || day.equals("tuesday") || day.equals("wednesday") || day.equals("thursday") || day.equals("friday");
        boolean Weekend = day.equals("saturday") || day.equals("sunday");

        if (product.equals("banana")) {
            if (Weekdays) {
                price = 2.50;
            } else if (Weekend) {
                price = 2.70;
            }
        } else if (product.equals("apple")) {
            if (Weekdays) {
                price = 1.20;
            } else if (Weekend) {
                price = 2.25;
            }
        } else if (product.equals("orange")) {
            if (Weekdays) {
                price = 0.85;
            } else if (Weekend) {
                price = 0.90;
            }
        } else if (product.equals("grapefruit")) {
            if (Weekdays) {
                price = 1.45;
            } else if (Weekend) {
                price = 2.60;
            }
        } else if (product.equals("kiwi")) {
            if (Weekdays) {
                price = 2.70;
            } else if (Weekend) {
                price = 3.00;
            }
        } else if (product.equals("pineapple")) {
            if (Weekdays) {
                price = 5.50;
            } else if (Weekend) {
                price = 5.60;
            }
        } else if (product.equals("grapes")) {
            if (Weekdays) {
                price = 3.85;
            } else if (Weekend) {
                price = 4.20;
            }
            double result = price * quantity;
            System.out.println(result);
        } else {
            System.out.println("error");
        }
    }
}