import java.util.Scanner;


class Main {

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

}
/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