Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
How much silver does the rank have that has gold smaller than 4, and a total of 1 and a rank larger than 6?

### Inputs:
table_name: table, columns: ['Rank', 'Gold', 'Silver', 'Bronze', 'Total']

### Response:
SELECT SUM Silver FROM table WHERE Gold < 4 AND Total = 1 AND Rank > 6