
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 morning, a lot of people gathered at the railway platform waiting for the train. One-tenth of all waiting passengers left on the first train, one-seventh of the remaining passengers left on the second train, and one-fifth of the remaining passengers left on the third train. How many passengers were originally on the platform if there were 216 passengers left after the third train departed?

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