import java.util.Scanner;

class Main{
  public static void main(String[] arg){
  	double r, menseki, ensyu;
  	Scanner in = new Scanner(System.in);
  	r = in.nextDouble();
  	menseki = r*r*Math.PI;
  	ensyu = r*2*Math.PI;
  	System.out.printf("%.6f %.6f",menseki,ensyu);
	}
}
/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