SPOJ Problem Set (classical)
4300. Rectangles
Problem code: AE00

Byteman has a collection of N squares with side 1.
How many different rectangles can he form using these squares?
Two rectangles are considered different if none of them can be rotated
and moved to obtain the second one.
During rectangle construction, Byteman can neither deform the squares
nor put any squares upon any other ones.
Input
The first and only line of the standard input contains one
integer N (1 ≤ N ≤ 10000).
Output
The first and only line of the standard output should contain
a single integer equal to the number of different rectangles
that Byteman can form using his squares.
Example
For the input data: 6
the correct result is: 8
Task author: Jakub Radoszewski.
