import java.util.Scanner;

public class MethodTest {

    static void printResultByType(String a, int b) {
        int number = 0;
        if (a.equals("int")) {
            number = b;
        }
        int result = number * 2;
        System.out.println(result);
    }

    static void printResultByType(String a, double b) {
        double number = 0;
        if (a.equals("real")) {
            number = b;
        }
        double result = number * 1.5;
        System.out.printf("%.2f", result);
    }

    static void printResultByType(String a, String b) {
        if (a.equals("string")) {
            System.out.println("$" + b + "$");
        }
    }

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String type = scanner.nextLine();
        if (type.equals("int")) {
            int command = Integer.parseInt(scanner.nextLine());
            printResultByType(type, command);
        } else if (type.equals("real")) {
            double command = Double.parseDouble(scanner.nextLine());
            printResultByType(type, command);
        } else {
            String command = scanner.nextLine();
            printResultByType(type, command);
        }
    }
}