
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
Xiaolong took the escalator down in the mall. He walked down at a pace of one step per step and took 30 steps to reach the bottom. Suddenly, he realized that he had left his bag at the shopping area. Then, he rushed back up the escalator at three times the speed he went down, which resulted in him taking 90 steps to reach the top. When the escalator stopped, the total number of visible steps outside was.

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