<|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
 Use 40 yuan to buy exercise books priced at 2 yuan, 5 yuan, and 11 yuan each. Buy at least one of each kind, and spend exactly 40 yuan. How many different ways are there to purchase the exercise books? 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
5
Use 40 yuan to buy exercise books priced at 2 yuan, 5 yuan, and 11 yuan each. Buy at least one of each kind, and spend exactly 40 yuan. How many different ways are there to purchase the exercise books?
test