
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
Christine has 15 boxes in her storage room. Eight of these boxes contain markers, five boxes contain sharpies, and four boxes contain both markers and sharpies. How many boxes contain neither markers nor sharpies?

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