
import java.util.*;
import java.text.*;

class Main{
public static void main(String[] args){
Scanner s = new Scanner(System.in);
	  double r = s.nextDouble();
	  double m = r*r*3.14159265359;
	  double n = 2*r*3.14159265359;
	  DecimalFormat fm = new DecimalFormat("#.######");
      System.out.println(fm.format(m)+" "+fm.format(n));
	 }
	}
/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