user: Question: Which Pick # is the highest one that has an Overall larger than 21, and a College of north carolina, and a Round smaller than 3?
Columns: ['Round', 'Pick #', 'Overall', 'Name', 'Position', 'College']
Types: ['real', 'real', 'real', 'text', 'text', 'text']
Sample row: [1.0, 21.0, 21.0, 'Renaldo Wynn', 'Defensive Tackle', 'Notre Dame']
SQL:

assistant: SELECT MAX("Pick #") FROM "Table" WHERE "Overall" > 21.0 AND "College" = 'north carolina' AND "Round" < 3.0;