import java.util.Scanner;

public class FruitShop {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String produkt = scanner.nextLine();
        String dayOfWeek = scanner.nextLine();
        double amount = Double.parseDouble(scanner.nextLine());
        double praice = 0;
        switch (dayOfWeek) {
            case "Monday":
            case "Tuesday":
            case "Wednesday":
            case "Thursday":
            case "Friday":
                if (produkt.equals("banana")) {
                    praice = amount * 2.50;
  					System.out.printf("%.2f ", praice);
                } else if (produkt.equals("apple")) {
                    praice = amount * 1.20;
					  System.out.printf("%.2f ", praice);
                } else if (produkt.equals("orange")) {
                    praice = amount * 0.85;
  				System.out.printf("%.2f ", praice);
                } else if (produkt.equals("grapefruit")) {
                    praice = amount * 1.45;
                      System.out.printf("%.2f ", praice);
                } else if (produkt.equals("kiwi")) {
                    praice = amount * 2.70;
					  System.out.printf("%.2f ", praice);
                } else if (produkt.equals("pineapple")) {
                    praice = amount * 5.50;
					  System.out.printf("%.2f ", praice);
                } else if (produkt.equals("grapes")) {
                    praice = amount * 3.85;
					  System.out.printf("%.2f ", praice);
                } else {
                    System.out.println("error");
                }
                break;
            case "Saturday":
            case "Sunday":
                if (produkt.equals("banana")) {
                    praice = amount * 2.70;
  System.out.printf("%.2f ", praice);
                } else if (produkt.equals("apple")) {
                    praice = amount * 1.25;
  System.out.printf("%.2f ", praice);
                } else if (produkt.equals("orange")) {
                    praice = amount * 0.90;
  System.out.printf("%.2f ", praice);
                } else if (produkt.equals("grapefruit")) {
                    praice = amount * 1.60;
  System.out.printf("%.2f ", praice);
                } else if (produkt.equals("kiwi")) {
                    praice = amount * 3.00;
  System.out.printf("%.2f ", praice);
                } else if (produkt.equals("pineapple")) {
                    praice = amount * 5.60;
  System.out.printf("%.2f ", praice);
                } else if (produkt.equals("grapes")) {
                    praice = amount * 4.20;
  System.out.printf("%.2f ", praice);
                } else {
                    System.out.println("error");
                }
                break;
				default:
 System.out.println("error");
break;

        }

    }
}