
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		// TODO ?????????????????????????????????????????????


		Scanner scan = new Scanner(System.in);

		double r = scan.nextDouble();

		scan.close();

		double dbPi = Math.PI;

		//System.out.println("??" + dbPi);

		double outLine = 2 * dbPi * r;
		double area = dbPi * (r * r);
		System.out.printf("%.6f",area);
		System.out.printf(" " + "%.6f",outLine);



	}
}
/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