
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 high school has three grades in its senior section. The first grade has 400 students. Using stratified sampling, a sample of 45 students is drawn, with 15 from the second grade and 10 from the third grade. What is the total number of students in the high school section?

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