
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 pond is covered by water lilies that grow at a rate of doubling every day, starting from April 1st. The pond is fully covered in 30 days. On which day of April can the water lilies cover half of the pond?

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