
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
A shop held a pen promotion event with the following method: for every 2 pens bought by customers, they receive a free teddy bear; if fewer than 2 pens are bought, no teddy bear is given. The profit for selling 1 pen is 7 yuan, and the cost price of 1 teddy bear is 2 yuan. The total profit for this promotion event was 2011 yuan. How many pens did the shop sell during this promotion?

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