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 = scan.nextDouble();
		double sum = Math.PI * Math.pow(r, 2);
		double length = 2 * Math.PI * r;
		System.out.println(BigDecimal.valueOf(sum).toPlainString() + " " + BigDecimal.valueOf(length).toPlainString());
	}

}
/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