import java.util.Scanner;
public class Main{
	public static void main(String[] args){
		Scanner in = new Scanner(System.in);
		double a = in.nextDouble();
		double area = a*a*Math.PI;
		double circumference = 2*a*Math.PI;
		String x = String.format("%.6f", area);
		String y = String.format("%.6f", circumference);
		System.out.println(x+" "+y); 
	}
}
/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