user: Question: for the name of jamar jackson what is the total of Number?
Columns: ['Position', 'Number', 'Name', 'Class', 'Injury (Status)', 'Last Update']
Types: ['text', 'real', 'text', 'text', 'text', 'text']
Sample row: ['FB', 32.0, 'Joe Surratt', 'Sr', 'Fractured Right Fibula (Out Indefintely)', 'August 18, 2007']
SQL:

assistant: SELECT SUM("Number") FROM "Table" WHERE "Name" = 'jamar jackson';