import java.io.*;

class Main {
	public static void main(String[] args) throws IOException {
		BufferedReader br =
			new BufferedReader(new InputStreamReader(System.in));

		String input = br.readLine();
		double r = Double.parseDouble(input);

		double s = r * r * Math.PI;
		double l = r * 2 * Math.PI;

//		System.out.printf("%.6f", "%.6f", s, l);

		String ansS = String.format("%.6f", s);
		String ansL = String.format("%.6f", l);

		System.out.println(ansS + " " + ansL);
	}
}
/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