
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 15 boxes in a storeroom. Eight of these boxes contain markers, five contain erasers, and four of these boxes contain both markers and erasers. How many boxes contain neither markers nor erasers?

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