Many of SPOJ problems are not supported.

[fukatani]

ex.

https://www.spoj.com/problems/MKLABELS/

<h3>Example</h3>
  |  
  | <pre>
  | <b>Input:</b>
  | 2
  | 3
  | 4
  | 5
  | 0
  |  
  | <b>Output:</b>
  | Case 1, N = 2, # of different labelings = 1
  | Case 2, N = 3, # of different labelings = 3
  | Case 3, N = 4, # of different labelings = 16
  | Case 4, N = 5, # of different labelings = 125
  | </pre>
  |