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

### Instruction:
Can you tell me the sum of Grid that has the Manufacturer of aprilia, and the sandro cortese?

### Inputs:
table_name: table, columns: ['Rider', 'Manufacturer', 'Laps', 'Time', 'Grid']

### Response:
SELECT SUM Grid FROM table WHERE Manufacturer = aprilia AND Rider = sandro cortese