
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 the spring of 2001, a school started with 1000 students participating in an annual health awareness marathon. The organizers expect that each subsequent year, participation will increase by 100% until 2003. Starting from 2004, a new mental health workshop is introduced, attracting a consistent additional 500 participants each year alongside the regular increase. Calculate the number of expected participants by the spring of 2005.
A) 9000
B) 17000
C) 17500
D) 18000
E) 20000

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