//9
public class MyClass {
    public static void main(String args[]) {
        for(int i = 1;i <= 10;i++)
        System.out.println(i);
    }
}
//10
public class MyClass {
    public static void main(String args[]) {
        java.util.Scanner scanner = new java.util.Scanner(System.in);
        double number = scanner.nextDouble();
        while (number >= 0) {
            System.out.printf("Result: %.2f \n", number * 2);
            number = scanner.nextDouble();
        }
        System.out.println("Negative number!");
    }
}