import java.io.*;
 
class Main {
  public static void main(String[] args)throws IOException{
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    double r = Double.parseDouble(br.readLine());
    
    double pi = Math.PI;
    double S = r*r*pi;
    double R = 2*r*pi;
    System.out.printf("%.6f %.6f", S, R);
  }
}
/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