package algorithm.baek.etc;

import algorithm.TestCase;

import java.io.*;

import java.text.ParseException;

public class TaxiGeometry implements TestCase {

public static final double PI = 3.14159265358979323846;

@Override

public void test() throws ParseException, IOException {

BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

double R = Double.parseDouble(br.readLine());

System.out.println(R * R * Math.PI);

System.out.println(2 * R * R);

}

}