
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
Compute the following sequence sum: $2000 - 1995 + 1990 - 1985 + \ldots + 15 - 10$.
A) 980  
B) 985  
C) 990  
D) 995  
E) 1000

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