
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 mathematics competition with 1000 participating students, each student is assigned a number: 0001, 0002, 0003, ..., 1000. By using systematic sampling to draw a sample of 50 students, if the number drawn in the first group is 0015, then the number drawn in the 21st group is ______.

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