user: ### NOW ANSWER:
Question: What is Melaine Walker's Rank?
Columns: ['Rank', 'Heat', 'Name', 'Nationality', 'Result']
Types: ['real', 'real', 'text', 'text', 'text']
Sample row: [1.0, 3.0, 'Melaine Walker', 'Jamaica', '54.46']
SQL:

assistant: SELECT SUM("Rank") FROM "Table" WHERE "Name" = 'Melaine Walker';