<|im_start|>system
You are a helpful assistant. You first think about the reasoning process in the mind and then provide the user with the answer. You should try to truely solve the question by yourself without cheating.  <|im_end|>
<|im_start|>user
 As shown in the figure, to move from A to B, one moves one step at a time, and can only move down or to the right. By adding all the numbers along the way (if they land on a black cell, they directly add 5), the final total sum is 51. How many different paths are there? Show your work in <think> </think> tags. And return the final answer in <answer> </answer> tags.<|im_end|>
<|im_start|>assistant
Let me solve this step by step.
<think>
user
4
As shown in the figure, to move from A to B, one moves one step at a time, and can only move down or to the right. By adding all the numbers along the way (if they land on a black cell, they directly add 5), the final total sum is 51. How many different paths are there?
test