import java.util.Scanner;

public class Main{
    public static void main(String[] args){
    	Scanner sc = new Scanner(System.in);

    		double r=sc.nextDouble();


    		double ans1=r*r*Math.PI;
    		double ans2=r*2*Math.PI;

    		System.out.printf("%.6f %.6f\n",ans1,ans2);

    		}
    		}
    		

/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