
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 theater has a total of 1000 seats, arranged in several rows, with the total number of rows being more than 16. Starting from the second row, each row has one more seat than the previous row. How many seats are there in the theater in total?

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