import java.util.Scanner;

public class Main{
    public static void main(String[] args){
	Scanner stdin = new Scanner(System.in);
        double r = stdin.nextDouble();
	double x = Math.PI;
	double s = (double)x*r*r;
	double l = (double)2*x*r;
	System.out.printf("%.6f %.6f %n", s, 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