import java.util.Scanner;

public class CircleAreaAndPerimeter {
    public static void main(String[] args) {
        Scanner console = new Scanner(System.in);
        double redius = Double.parseDouble(console.nextLine());


        double area = Math.PI * radius * radius;
        double perimeter = Math.PI * radius * 2;


        System.out.printlntf("%.2f", area);
        System.out.println();
        System.out.printf("%.2f", perimeter);

    }


}