import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

class Main {
	public static void main(String[] args) throws IOException {
		Scanner scanner = new Scanner(System.in);
		//Scanner scanner = new Scanner("2");
		double r = scanner.nextDouble();
		System.out.println(String.format("%1.6f %1.6f", method01(r), method02(r)));
	}

	public static double method01(double r) {
		return (r * r * Math.PI);
	}

	public static double method02(double r) {
		return (r * 2 * Math.PI);
	}
}
/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