EMP  University Employees
On some island each inhabitant is either a knight who only tells the truth, or a liar who always lies. Also, on the island there exists a university of technology where some of the inhabitants work. All of the university employees will always tell you the following two things, no matter which employee you ask:
It is also known that no two employees of the university have an identical salary, and no two work equally. Write a program which will compute how many persons are employed by this university.
Input
The only input line contains two integers N and M, with one space between them [N, M <= 1000000000].
Output
The output must contain only one integer  the total number of employees of this university, or 0 if there is no way to find the number of employees.
Example
Input: 1 1 Output: 2
Author: Filimonenkov D.O.
hide comments
Tejas Shah:
20120623 13:08:00
The sale for points question! :P 

Darky:
20120616 20:57:07
Not for spoj! 

:):
20120616 15:08:13
what is this!!! free points in classical!!!!! 

The Mundane Programmer:
20120611 10:00:19
delete it buddy.... 

The Mundane Programmer:
20120611 09:59:55
delete it buddy.... 

Kyle Dencker:
20120609 13:53:03
Could anyone give a few more test cases? I am not quite getting what they are asking. 

Pranshul Agarwal:
20120609 12:39:35
even not for the begineers 

Ashhar Jawaid:
20120525 20:32:14
what the hell is this question


Vrian7:
20120520 21:03:09
this is problem is tutorial..


Mathan Kumar:
20120511 15:00:18
Enna Koduma sir ithu?? Not even qualify for tutorials.. 
Added by:  Roman Sol 
Date:  20060424 
Time limit:  1s 
Source limit:  50000B 
Memory limit:  1536MB 
Cluster:  Cube (Intel G860) 
Languages:  All except: ERL JSRHINO NODEJS PERL6 VB.NET 
Resource:  ZCon 2007 