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

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		
		BigDecimal a = BigDecimal.valueOf(sc.nextDouble());
		BigDecimal rate = BigDecimal.valueOf(Math.PI);
		
		BigDecimal beforeArea = a.multiply(a).multiply(rate);
		BigDecimal beforeLength = a.multiply(BigDecimal.valueOf(2.0)).multiply(rate);
		
		String afterArea = String.format("%.6f",beforeArea);
		String afterLength = String.format("%.6f",beforeLength);
		
		System.out.println(afterArea + " " + afterLength);
	}

}
/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