import java.util.*;
import java.io.*;

public class Main{
 public static void main(String[] args) throws IOException
 {
   Scanner sc = new Scanner(System.in);
   InputStreamReader is = new InputStreamReader(System.in);
   BufferedReader br = new BufferedReader(is);
   
   String inStr = br.readLine();
   double r = Double.parseDouble(inStr);
 
    System.out.printf("%.6f", r*r*Math.PI);
    System.out.print(" ");
    System.out.printf("%.6f", 2*r*Math.PI);
    System.out.println("");
 }
}
/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