
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
There are 1000 numbers arranged in a row, where for any three consecutive numbers, the middle number is equal to the sum of the two surrounding numbers. If the first and second numbers are both 1, calculate the sum of these 1000 numbers.

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