import java.math.BigDecimal;
import java.util.Scanner;

public class Main {
	public static void main(String[] args){
		Scanner scan = new Scanner(System.in);
		double r = Double.parseDouble(scan.nextLine());
		double dbCir = (Math.PI * r * 2.0);
		double dbArea = (Math.PI * r * r);
		BigDecimal x = new BigDecimal(dbCir);
		BigDecimal y = new BigDecimal(dbArea);
		x = x.setScale(6, BigDecimal.ROUND_HALF_UP);
		y = y.setScale(6, BigDecimal.ROUND_HALF_UP);

		System.out.println(y + " " + x);
		scan.close();
	}
}
/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