AE00  Rectangles
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.
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L:
20130620 11:49:09
@Dark Knight


Sagar Grover:
20130619 15:41:29
Recursion makes it easy 

king:
20130617 12:11:42
O(n^2) got passed :) 

chk:
20130603 10:08:34
nice and easy :)


Ankur Yadav:
20130530 15:14:50
what is the answer for n=10000? 

Amey Telawane:
20130530 10:49:34
easy problem,,, very short code :) 

Rowan Zafer:
20130514 17:40:16
Test case 10, keeps bringing me down 

aya mohsen:
20130423 12:54:58
momkn 7ad y2oly el test cases?


ওয়াসী (Wasi):
20130406 12:29:04
Nice problem


Juɑƞ Chɑpɑrro:
20130329 02:47:34
10 Lines ;) 
Added by:  Race with time 
Date:  20090503 
Time limit:  1s 
Source limit:  50000B 
Memory limit:  1536MB 
Cluster:  Cube (Intel G860) 
Languages:  All except: ERL JSRHINO NODEJS PERL6 VB.NET 
Resource:  Algorithmic Engagements 2009 