
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
Given that a systematic sampling method is used to draw a sample of size 5 from a class of 60 students, with the students with seat numbers 3, 15, 39, and 51 are all in the sample, determine the seat number of the remaining student in the sample.

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