transport

import java.util.Scanner;

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

        double km = Double.parseDouble(scanner.nextLine());
        String DayOrNight = scanner.nextLine();

        if (km >= 100) {
            System.out.printf("%.1f",0.06 * km);
        } else if (km >= 20) {
            System.out.println(0.09 * km);
        } else if (DayOrNight.equals("day")) {
            System.out.println(0.70 + km * 0.79);
        } else if(DayOrNight.equals("night"))
            System.out.println(0.70 + km * 0.90);
        }
    }