
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
In a certain sequence the first term is \( a_1 = 2010 \) and the second term is \( a_2 = 2011 \). Further, the values of the remaining terms are chosen so that \( 2(a_n + a_{n+1} + a_{n+2}) = 2n + 3 \) for all \( n \geq 1 \). Determine \( a_{1000} \).

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