
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
Management personnel caught 30 fish from a pond, marked them, and then released them back into the pond. Ten days later, they caught 50 fish from the pond again, among which there were 2 marked fish. Based on the above data, it can be estimated that there are a total of ______ fish in the pond.

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