import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		double r = scan.nextDouble();
		double PI = Math.PI;
		scan.close();

		if (0 < r && r < 10000) {
			double res1 = r * r * PI;
			double res2 = 2 * r * PI;

			System.out.printf("%.6f",res1);
			System.out.print(" ");
			System.out.printf("%.6f",res2);
		}

	}

}
/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