import java.io.*;

class Main{
 public static void main(String[] args)throws IOException{
  double r;
  String area,rect;
   BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
  
   String str = br.readLine(); 
   String[] strAry = str.split(" ");
   r = Double.parseDouble(strAry[0]);  
   area=String.format("%.5f", r*r*3.141592653589);    
   rect=String.format("%.5f", 2*r*3.141592653589);    
   
   System.out.println(area + " "+ rect); 
 }
}
/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