Problem B - Joana and the Odd Numbers
-------------------------------------

Joana loves playing with odd numbers. The other day, she started
writing, in each line, an odd number of odd numbers. It looked as
follows:

 1
 3  5  7
 9 11 13 15 17
19 21 23 25 27 29 31
...

On a certain line Joana wrote 55 odd numbers. Can you discover the sum
of the last three numbers written in that line? Can you do this more
generally for a given quantity of odd numbers?

Given the number N of odd numbers in a certain line, your task is to
determine the sum of the last three numbers of that line.

Input
-----

The input is a sequence of lines, one odd number N (1 < N < 10^9) per
line. The last line of input contains the number 0. No output should be
produced for this last line.

Output
------

For each input line write the sum of the last three odd numbers written
by Joana in that line with N numbers. This sum is guaranteed to be less
than 2^63.

Sample Input
------------

3
5
7

Output for Sample Input
-----------------------

15
45
87