
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
Use 40 yuan to buy exercise books with unit prices of 2 yuan, 5 yuan, and 11 yuan. Each type must be bought at least one, and the money must be spent exactly. How many different purchasing methods are there?

Present the answer in LaTex format: \boxed{Your answer}
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