
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, 1000 students are numbered as follows: 0001, 0002, 0003, ..., 1000. It is planned to draw a sample of size 50 by dividing into 50 parts using systematic sampling. If the first part includes the numbers 0001, 0002, ..., 0020, and a number 0015 is randomly selected from it, then the 40th number will be \_\_\_\_\_\_.

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