
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
To investigate the understanding of the "Belt and Road" policy among students at a certain university, a stratified sampling method is used to select a sample with a size of $500$. Among them, $200$ are from the freshman year, $100$ are from the sophomore year. If there are a total of $2000$ students in other grades, then the total number of students at the university is ______.

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