import java.util.Scanner;

public class FruitShop {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String fruit = scanner.nextLine();
        String day = scanner.nextLine();
        double quantity = Double.parseDouble(scanner.nextLine());
        double price = quantity * 0;


      if (day.equals("Monday") || day.equals("Tuesday") || day.equals("Wednesday") ||
              day.equals("Thursday") || day.equals("Friday")) {
          if (fruit.equals("banana")) {
              price = quantity * 2.50;
              System.out.printf("%.2f", price);
          } else if (fruit.equals("apple")) {
              price = quantity * 1.20;
              System.out.printf("%.2f", price);
          } else if (fruit.equals("orange")) {
              price = quantity * 0.85;
              System.out.printf("%.2f", price);
          } else if (fruit.equals("grapefruit")) {
              price = quantity * 1.45;
              System.out.printf("%.2f", price);
          } else if (fruit.equals("kiwi")) {
              price = quantity * 2.70;
              System.out.printf("%.2f", price);
          } else if (fruit.equals("pineapple")) {
              price = quantity * 5.50;
              System.out.printf("%.2f", price);
          } else if (fruit.equals("grapes")) {
              price = quantity * 3.85;
              System.out.printf("%.2f", price);
          } else {
              System.out.println("error");
          }
      }
        if (day.equals("Saturday") || day.equals("Sunday")) {
            if (fruit.equals("banana")) {
                price = quantity * 2.70;
                System.out.printf("%.2f", price);
            } else if (fruit.equals("apple")) {
                price = quantity * 1.25;
                System.out.printf("%.2f", price);
            } else if (fruit.equals("orange")) {
                price = quantity * 0.90;
                System.out.printf("%.2f", price);
            } else if (fruit.equals("grapefruit")) {
                price = quantity * 1.60;
                System.out.printf("%.2f", price);
            } else if (fruit.equals("kiwi")) {
                price = quantity * 3.00;
                System.out.printf("%.2f", price);
            } else if (fruit.equals("pineapple")) {
                price = quantity * 5.60;
                System.out.printf("%.2f", price);
            } else if (fruit.equals("grapes")) {
                price = quantity * 4.20;
                System.out.printf("%.2f", price);
            } else {
                System.out.println("error");
            }
        }


    }
}