import java.util.Scanner;

class Main{
     public static void main(String[] args){
    	Scanner scan = new Scanner(System.in);
    	double r = scan.nextDouble();
    	double pi = 3.141592653589;
    	
    	System.out.println(String.format("%.8f", r*r*pi) + " " + String.format("%.8f", 2.0*r*pi));
    	
     }
}
/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