import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        double num = Double.parseDouble(sc.nextLine());

        double ans1 = num * num * Math.PI;
        double ans2 = (num * 2) * Math.PI;

        System.out.println(String.format("%.5f", ans1) + " " + String.format("%.5f", ans2));


    }
}
/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