
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 triangle is constructed with the numbers 1, 2, 3, ..., 2000 as the first row. Each subsequent number is the sum of the two numbers immediately above it. Find the number at the bottom of the triangle.

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