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 = 3.141592653589;
		 String area = String.format("%.6f", 1.0*r*r*pi);
		 String circle = String.format("%.6f", r*2*pi);
		 System.out.println(area + " " + circle);
	}

}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz