import java.util.Scanner;
import java.util.Formatter;
public class Main
{
	public static void main(String args[])
	{
		Scanner inp = new Scanner(System.in);
		Formatter f1 = new Formatter();
		Formatter f2 = new Formatter();
		double r;
		r = inp.nextDouble();
		f1.format("%.6f",r*r*Math.PI);
		f2.format("%.6f",2*r*Math.PI);
		System.out.println(f1 + " " + f2);
	}
}
/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