import java.util.Scanner;

class Main {
  public static void main(String[] args){
    Scanner cin = new Scanner(System.in);
    double r = cin.nextDouble();

    System.out.printf("%.6f %.6f\n", cal_area(r), cal_cirum(r));
  }

  private static double cal_cirum(double r) {
    return (r * 2 * Math.PI);
  }

  private static double cal_area(double r) {
    return (r * 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