user: Question: How many Silver medals did the Nation with a Rank of less than 1 receive?
Columns: ['Rank', 'Nation', 'Gold', 'Silver', 'Bronze', 'Total']
Types: ['real', 'text', 'real', 'real', 'real', 'real']
Sample row: [1.0, 'Japan', 6.0, 4.0, 1.0, 11.0]
SQL:

assistant: SELECT SUM("Silver") FROM "Table" WHERE "Rank" < 1.0;