import java.util.Scanner;

/**
 * Created by Ivaylo on 24.4.2017 г..
 */

public class Multi {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        double moneyTostring = Double.parseDouble(scan.nextLine());
        String firstCurrency = scan.nextLine();
        String secondCurrency = scan.nextLine();
        double BGN = 1;
        double USD = 1.79549;
        double EUR = 1.95583;
        double GBP = 2.53405;

        if (firstCurrency.equals("BGN")) {
            if (secondCurrency.equals("USD")) {
                System.out.printf("%.2f", BGN / USD * moneyTostring);
            } else if (secondCurrency.equals("EUR")) {
                System.out.printf("%.2f", BGN / EUR * moneyTostring);
            } else if (secondCurrency.equals("GBP")) {
                System.out.printf("%.2f", BGN / GBP * moneyTostring);
            }
        }

    }
}