import java.util.Scanner;

class MathApp {
    // Multiply two integers
    public static int multiply(int a, int b) {
        return a * b;
    }

    // Multiply two floating-point numbers
    public static double multiply(double a, double b) {
        return a * b;
    }

    // Repeat a string 'n' times
    public static String multiply(String s, int n) {
        if (n < 0) {
            return "Invalid Input";
        }
        return s.repeat(n);
    }

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        
        if (scanner.hasNextInt()) {
            int first = scanner.nextInt();
            if (scanner.hasNextInt()) {
                int second = scanner.nextInt();
                System.out.println(multiply(first, second));
            } else {
                System.out.println("Invalid input");
            }
        } else if (scanner.hasNextDouble()) {
            double first = scanner.nextDouble();
            if (scanner.hasNextDouble()) {
                double second = scanner.nextDouble();
                System.out.printf("%.2f\n", multiply(first, second));
            } else {
                System.out.println("Invalid Input");
            }
        } else if (scanner.hasNext()) {
            String str = scanner.next();
            if (scanner.hasNextInt()) {
                int repeat = scanner.nextInt();
                System.out.println(multiply(str, repeat));
            } else {
                System.out.println("Invalid Input");
            }
        } else {
            System.out.println("Invalid Input");
        }
        
        scanner.close();
    }
}