
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
The management staff caught 30 fish from a pond, marked them, and then released them back into the pond to mix thoroughly with the rest of the fish. 10 days later, they caught another 50 fish and found that 2 of them were marked. Based on the information provided, it is estimated that there are ______ fish in the pond.

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