In this task, you're given a statement, further information available on a particular linked term from the statement, and a question. Your job is to generate the answer to the question by using the information provided. If there is no clear answer obtainable, output 'none'.
Q: Context: Boyd, winner of season 7 of NBC's reality TV singing competition The Voice, Link Information: Adam Levine & Blake Shelton returned as coaches for their seventh season. Gwen Stefani & Pharrell Williams joined Question: How many of the judges of the season of the show Boyd won were also judges in that show's first season?
A:
Answer: 2