
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 the sum:
\[\frac{1}{t_1} + \frac{1}{t_2} + \frac{1}{t_3} + ... + \frac{1}{t_{2003}}\]
where $t_n = \frac{n(n+1)}{2}$ denotes the n-th triangular number.
A) $\frac{4005}{2003}$
B) $\frac{2003}{2002}$
C) $\frac{4006}{2003}$
D) $\frac{4007}{2004}$
E) $\frac{4004}{2003}$

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