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

### Instruction:
How many Tries against has a Try diff of –17 and Points for smaller than 80?

### Inputs:
table_name: table, columns: ['Team', 'Tries for', 'Tries against', 'Try diff', 'Points for', 'Points against', 'Points diff']

### Response:
SELECT COUNT Tries against FROM table WHERE Try diff = –17 AND Points for < 80