Problem Statement 
 John and Brus are bored.
They have n+m common friends.
The first n of them are bored and other m are not.
John chooses the jth (1based) friend for a talk.
If the friend is not bored, he becomes bored after the talk.
Brus does the same with the bth (1based) friend.
Note that John and Brus can't choose the same friend.
You have to find the number of bored friends after the talks.


Definition 
 Class:  TheBoredomDivTwo  Method:  find  Parameters:  int, int, int, int  Returns:  int  Method signature:  int find(int n, int m, int j, int b)  (be sure your method is public) 




Constraints 
  n will be between 1 and 47, inclusive. 
  m will be between 1 and 47, inclusive. 
  j will be between 1 and n+m, inclusive. 
  b will be between 1 and n+m, inclusive. 
  j and b will be different. 

Examples 
0)  
  Returns: 2  The first friend is already bored and the second friend becomes bored after the talk with Brus. 


1)  
  Returns: 2  Here John and Brus choose two friends that are already bored. 


2)  
  Returns: 3  All the friends become bored. 


3)  
 