import java.util.Scanner;

public class FruitShop {
    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);
        String fruit = scanner.nextLine();
        String dayOfWeek = scanner.nextLine();
        double count = Double.parseDouble(scanner.nextLine());

        boolean isFruit = fruit.equals("banana") || fruit.equals("apple") || fruit.equals("orange") || fruit.equals("grapefruit")
        || fruit.equals("kiwi") || fruit.equals("grapes") || fruit.equals("pineapple");

        boolean weekday = dayOfWeek.equals("Monday") || dayOfWeek.equals("Tuesday") || dayOfWeek.equals("Wednesday")
                || dayOfWeek.equals("Thursday") || dayOfWeek.equals("Friday");

        double productPrice = 0;

        if (weekday && isFruit){
            switch (fruit){
                case "banana":
                    productPrice = count * 2.5;
                    System.out.println(productPrice);
                    break;
                case "apple":
                    productPrice = count * 1.2;
                    System.out.println(productPrice);
                    break;
                case "orange":
                    productPrice = count * 0.85;
                    System.out.println(productPrice);
                case "grapefruit":
                    productPrice = count * 1.45;
                    System.out.println(productPrice);
                    break;
                case "kiwi":
                    productPrice = count * 2.7;
                    System.out.println(productPrice);
                    break;
                case "pineapple":
                    productPrice = count * 5.5;
                    System.out.println(productPrice);
                    break;
                case "grapes":
                   productPrice = count * 3.85;
                    System.out.println(productPrice);
                    break;


            }
        }else if (!weekday && isFruit){
            switch (fruit){
                case "banana":
                    productPrice = count * 2.7;
                    System.out.println(productPrice);
                    break;
                case "apple":
                    productPrice = count * 1.25;
                    System.out.println(productPrice);
                    break;
                case "orange":
                    productPrice = count * 0.90;
                    System.out.println(productPrice);
                    break;
                case "grapefruit":
                    productPrice = count * 1.60;
                    System.out.println(productPrice);
                    break;
                case "kiwi":
                    productPrice = count * 3;
                    System.out.println(productPrice);
                    break;
                case "pineapple":
                    productPrice = count * 5.6;
                    System.out.println(productPrice);
                    break;
                case "grapes":
                    productPrice = count * 4.2;
                    System.out.println(productPrice);
                    break;
            }
        }else{
            System.out.println("error");
        }

    }
}