
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 certain city, there are 300 large supermarkets, 600 medium-sized supermarkets, and 2100 small supermarkets. In order to understand the business situation of each type of supermarket, a sample of size 100 is drawn using stratified sampling method. The number of small supermarkets that should be selected in the sample is ______.

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