import java.util.Scanner;

public class Main{
	public static void main(String[] args){
        
        Scanner sc = new Scanner(System.in);
        double x=Math.PI;
        double r = sc.nextDouble();
        System.out.println(String.format("%.6f",r*r*x));
        System.out.println(String.format("%.6f",2*r*x));
   }
}

/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