import java.util.Scanner;

public class Main {

    public static void main(String[] args){
		Scanner scan = new Scanner(System.in);

		double r = scan.nextDouble();//r = ??????
		double men = (double)r * r *  3.14159265358979323846264338327950288;
		double ensyu = (double)r * 2 * 3.14159265358979323846264338327950288;

		System.out.println(String.format("%f %f", men, ensyu));
        scan.close();
    }

}
/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