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 is so happy to see PersonY. Intent:
Unknown

Event:PersonX inhibits ___ in vitro. Intent: 1) this is not a rule for people
Positive

Event:PersonX snatches ___ away. Intent: 1) to stay healthy

Negative