
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 unit has $420$ employees and uses a systematic sampling method to select $21$ people for a questionnaire survey. The $420$ people are randomly numbered from $1$ to $420$. The number of people selected with numbers falling within the interval $[281, 420]$ is _______.

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