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

### Instruction:
How much Grid has a Time/Retired of +0.785, and Laps larger than 29?

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

### Response:
SELECT SUM Grid FROM table WHERE Time/Retired = +0.785 AND Laps > 29