import java.util.Scanner;

public class Main {
	public static void main(String [] args){
		Scanner scan = new Scanner(System.in);
		
		double r = scan.nextDouble();
		double s=0.0, l=0.0;
		
		s = r * r * Math.PI;
		l = 2 * Math.PI * r;
		
		System.out.println(String.format("%5f", s)+" "+String.format("%5f", 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