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

### Instruction:
How many constructors had a grid of 13?

### Inputs:
table_name: table, columns: ['Pos', 'Grid', 'Car', 'Driver', 'Constructor', 'Manufacturer', 'Laps', 'Laps Led', 'Points']

### Response:
SELECT COUNT Constructor FROM table WHERE Grid = 13