
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 researcher wants to estimate the number of birds in a forest. On April 10, he captures and tags 120 birds, then releases them. On August 10, he captures another sample of 150 birds, among which he finds 4 tagged birds. He estimates that 30% of the birds tagged in April are no longer in the forest in August due to migration and mortality, and 50% of the birds in August were not there in April due to new arrivals and births. How many birds were in the forest on April 10 according to his estimate?

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