You are provided with an "Event" and it's "Intent" related to PersonX. Determine the sentiment value of the given input as either "Positive", "Negative", and "Unknown". 

Event:PersonX wants to be a writer. Intent:
Unknown

Event:PersonX sells PersonY's wares. Intent: 1) inform
Negative

Event:PersonX uses as PersonY instrument. Intent: 1) to prove his worth

Positive