import java.util.Scanner;

public class Main {
  private static double r;
  public static void main(String[] args) {
    Scanner stdIn = new Scanner(System.in);
    r = stdIn.nextDouble();
    double Pi = Math.PI;
    System.out.printf("%.6f %.6f\n", (r * r * Pi), (2 * Pi * 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