import java.util.Scanner;

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

        int size = Integer.parseInt(console.nextLine());
        String filling = console.nextLine().toLowerCase();
        int quantity = Integer.parseInt(console.nextLine());
        String decoration = console.nextLine().toLowerCase();
        int fillingQuantity = 1;
        int decorationQuantity = 1;

        if (decoration.equals("yes")) {
            decorationQuantity = 5;
        }
        switch (size) {
            case 10:
                switch (filling) {
                    case "milk cream":
                        fillingQuantity = 15;
                        break;
                    case "cream":
                        fillingQuantity = 10;
                        break;
                    case "chocolate":
                        fillingQuantity = 20;
                        break;
                }
                break;
            case 12:
                switch (filling) {
                    case "milk cream":
                        fillingQuantity = 20;
                        break;
                    case "cream":
                        fillingQuantity = 15;
                        break;
                    case "chocolate":
                        fillingQuantity = 25;
                        break;
                }
                break;
            case 16:
                switch (filling) {
                    case "milk cream":
                        fillingQuantity = 25;
                        break;
                    case "cream":
                        fillingQuantity = 20;
                        break;
                    case "chocolate":
                        fillingQuantity = 30;
                        break;
                }
                break;
        }
        double result = fillingQuantity * quantity + decorationQuantity;
        System.out.printf("%.2f", result);
    }
}