import java.util.Scanner;

public class Main {
	public static void main(String[] args){
		Scanner scan = new Scanner(System.in);
	    double a = Double.parseDouble( scan.next());
	    double pi=Math.PI;
	    
	    double area = a * a * pi;
	    double length = 2 * a * pi;
	    
	    String ar = String.format("%f", area);
	    String l = String.format("%f", length);
	    
	    System.out.println(ar + " "+ l);
 
	}
}
/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