import java.util.Scanner;

public class Main {
	public static void main(String[] args) {

		Scanner scanner = new Scanner(System.in);

		scanner.hasNext();

		double r = scanner.nextDouble();

		double circle = r * r * Math.PI;

		double ans2 = 2 * Math.PI * r;

		String circleAreaAns = String.format("%.6f", circle);

		String lengthCircumference = String.format("%.6f", ans2);

		System.out.print(circleAreaAns + " ");

		System.out.println(lengthCircumference);

	}
}
/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