phannguyenhongthuong@gmail.com

import java.util.Scanner;
public class Main{

     public static void main(String []args){
        Scanner sc = new Scanner(System.in);
        double r = sc.nextDouble();
        double pi = 3.14;
        double a = 2*pi*r;
        double b = pi*r*r;
        System.out.printf("%.3f", a + " " + b);
        
     }
}