
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 200 large supermarkets, 400 medium-sized supermarkets, and 1400 small supermarkets. To grasp the business conditions of these supermarkets, a stratified sampling method is used to select a sample of 100 supermarkets. How many medium-sized supermarkets should be included in the sample?

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