import java.util.Scanner;

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