
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
Define the sequence $b_1, b_2, b_3, \ldots$ by $b_n = \sum\limits_{k=1}^n \cos{k}$, where $k$ represents radian measure. Find the index of the 100th term for which $b_n > 0$.

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