
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
Calculate $E(1) + E(2) + E(3) + \cdots + E(200)$, where $E(n)$ sums the even digits of $n$.
A) 400
B) 800
C) 1600
D) 900
E) 2000

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