
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
Determine the value of $-1 + 2 + 3 - 4 - 5 - 6 + 7 + 8 + 9 + 10 - 11 - 12 - 13 - 14 - 15 + \dots + 64$, where the signs change after each triangular number (i.e., 1, 3, 6, 10, etc.).

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