user: Question: What is the total number of rounds of the end player with a pick number greater than 303?
Columns: ['Round', 'Pick', 'Player', 'Position', 'School/Club Team']
Types: ['real', 'real', 'text', 'text', 'text']
Sample row: [1.0, 2.0, 'Art Hunter', 'Offensive Tackle', 'Notre Dame']
SQL:

assistant: SELECT SUM("Round") FROM "Table" WHERE "Pick" > 303.0 AND "Position" = 'end';