import java.util.Scanner;
class Main{
public static void main(String[] args){
Scanner scan =new Scanner(System.in);
String R=scan.next();
double r=Double.parseDouble(R);
double a=r*r*3.141592653589;
double b=r*2.0*3.141592653589;
System.out.printf("%f %f\n",a,b);
}
}
/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