
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 certain unit has a total of 600 employees, of whom 250 are young employees, 200 are middle-aged employees, and 150 are elderly employees. A stratified sampling method is used to select a sample, and the sample contains 5 young employees. What is the sample size?

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