import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		// TODO ?????????????????????????????????????????????
		Scanner sc = new Scanner(System.in);
		String line = sc.nextLine();
		double r = Double.parseDouble(line);
		double pi = Math.PI;
		double menseki = r * r * pi;
		double enshuu = 2 * r * pi;
		System.out.printf("%.8f", menseki);
		System.out.print(" ");
		System.out.printf("%.8f", enshuu);
	}

}
/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