import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.*;
class Main{
	public static void main(String[] args){
		Scanner scan = new Scanner(System.in);
		double r = scan.nextDouble();
		double r2 = 1.0*r;
		
		double ensyu = r2 * 2 * 3.141592653589;
		double menseki = r2 * r2 * 3.141592653589;

		String ee =String.format("%.8f",ensyu);
		String mm =String.format("%.8f",menseki);
		System.out.println(mm+" "+ee);
	}
}
/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