Problem Statement  
A game is played as follows. The player is given a number p (his current pvalue) between 0 and N1 inclusive, where N is the number of elements in nexts.
The following steps are then repeated until the game ends:
 
Definition  
 
Constraints  
  nexts will contain between 1 and 50 elements inclusive.  
  Each element of nexts will be between 0 and N1 inclusive, where N is the number of elements in nexts.  
  score will be between 0 and N1 inclusive, where N is the number of elements in nexts.  
Examples  
0)  
 
1)  
 
2)  
 
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4)  
