import java.io.IOException;
import java.util.Scanner;

public class Main{
	public static void main(String[] args) throws IOException{
	Scanner sc = new Scanner(System.in);
	double r;
	double cir,area;

	r = Double.parseDouble(sc.next());
	cir = 2*Math.PI*r;
	area = Math.PI*r*r;

	System.out.printf("%.6f %.6f", area,cir);
	sc.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