
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
A conference hall is setting up seating for a lecture. Each complete row can contain $15$ chairs, and currently, there are $225$ chairs in total. If $140$ participants are expected to attend, how many chairs should be removed to have full rows with the least number of empty seats?

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