
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
Initially, one third of the people in a room leave at the start. Afterward, half of those who are left start to dance. There are then 18 people who are not dancing. Calculate the original number of people in the room.
A) $36$
B) $45$
C) $54$
D) $60$

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