
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 cells of a pyramid were filled according to the following rule: the sum of every two neighboring numbers was written above them. Some of the numbers were erased, resulting in the structure depicted in the image. What number was in the very top cell?

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