import java.io.*;
public class Main {
	public static void main(String[] args) throws IOException, NumberFormatException{
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		double r = Double.parseDouble(br.readLine());
		//計算
		double x = Math.PI * r * r;//面積
		double y = 2 * Math.PI * r;//円周
		String men = String.format("%.6f", x);
		String en = String.format("%.6f", y);
		System.out.println(men + " " + en);
		br.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