
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 a certain unit, there are $500$ middle-aged people, $400$ young people, and $300$ elderly people. With a probability of $0.4$ for each employee being selected, a sample of capacity $n$ was drawn from this unit. Therefore, $n=$ _______.

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