import java.util.Scanner;

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

        int n = Integer.parseInt(scanner.nextLine());
        String timeOfDay = scanner.nextLine();
        double price = 0;
        String transport = "";


        if (timeOfDay.equals("day") && n < 20) {
            price = (n *  0.79) +  0.70;
        }
        else if (n < 20) {
            price = (n * 0.90) + 0.70;
        }
        else if (n >= 100) {
            price = (n * 0.06);
        }
        else if (n >= 20) {
            price = n * 0.09;
        }
        System.out.printf("%.2f", price);
    }
}