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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bitswise:
20170708 22:38:21
Literally, took me like 2 minutes and I'm average at best! 

Ravi Jangra:
20170708 09:22:31
its all about finding the pattern and start an loop with optimised iterations 

lqv111996:
20170705 18:12:14
AC in the first! seem it is very simples 

hema_197:
20170623 09:54:05
Last edit: 20170708 20:50:18 

ashwani0605:
20170527 17:40:05
AC in one go, simply use general mathematics no use of using DP, just basic Adhoc 

bharanidharan1:
20170525 11:49:33
AC IN ONE GO... 

akash619j:
20170419 08:07:10
AC on one go though took about 3035 mins to be sure of correctness of my soln!!


nonushikhar:
20170330 20:31:43
AC in one go


xprilion:
20170321 09:40:15
AC in one! my 6th! :D 

ankitshrey112:
20170311 12:34:20
little bit of math...

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 