
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 fisherman cast a net into a pond and caught 30 fish. Marking each fish with a tag, he released the catch back into the pond. The next day, the fisherman cast the net again and caught 40 fish, among which two were tagged. Using this information, approximately estimate the number of fish in the pond.

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