Problem:
Circle

Write a program which calculates the area and circumference of a circle for given radius r.

Input

A real number r is given.

Output

Print the area and circumference of the circle in a line. Put a single space between them. The output should not contain an absolute error greater than 10-5.

Constraints

0 < r < 10000

Sample Input 1

2

Sample Output 1

12.566371 12.566371

Sample Input 2

3

Sample Output 2

28.274334 18.849556

Solution in C# (judge verdict: Wrong Answer)

using System;
using System.Collections.Generic;

class Program
{
	static void Main(string[] args)
	{

		//List<int> a = new List<int>();
		//List<int> b = new List<int>();

		//string[] s = Console.ReadLine().Split(' ');

		//long a = long.Parse(s[0]);

        double a = double.Parse(Console.ReadLine());


		Console.WriteLine("{0} {1}", 2.0 * a * Math.PI, a * a * Math.PI);

		//Console.WriteLine("");


	}
}