
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 school has 2000 students, among which there are 500 senior year students. To understand the physical condition of the students, a stratified sampling method by grade is used to draw a sample of 200 students from the school. The number of senior year students in the sample is

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