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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akash1234:
20190105 13:21:38
Ac in one go 

spd123:
20190101 17:08:18
Last edit: 20190101 17:17:05 

morphin3:
20181211 20:15:53
AC in one go!


Joeffison [UFCG]:
20181011 09:17:21
I got the pattern.


kamran_:
20180930 02:07:24
can we solve in O(1) time 

laidactienbn:
20180924 16:25:30
Helpppp!!!! I count for each factor of N


laidactienbn:
20180923 12:26:44
Last edit: 20180923 12:27:47 

fraxz:
20180919 09:01:15
It is just an easy math... You can solve it using 2 loops. But you need to do a little bit of optimization. Hint: You can do it in o(sqrt(n)) 

yamone_123:
20180805 09:10:18
Ac in one go! so ez


puddin:
20180623 12:18:09
try to see or figure out some formula,hint:loop will run upto sqrt(n) to calculate sum*******TC (root_n) 
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 