Problem Statement 
 You are given a int[] A. An integer K is irreducible with respect to A if K cannot be represented as a sum of one or more elements from A, where each element of A may be used at most once. Return the smallest positive integer that is irreducible with respect to A. 

Definition 
 Class:  IrreducibleNumber  Method:  getIrreducible  Parameters:  int[]  Returns:  int  Method signature:  int getIrreducible(int[] A)  (be sure your method is public) 




Constraints 
  A will contain between 1 and 3 elements, inclusive. 
  Each element of A will be between 1 and 100, inclusive. 

Examples 
0)  
  Returns: 3  1 can be expressed as 1, and 2 can be expressed as 1+1. 


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