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

### Instruction:
When 1180 am is the frequency how many call signs are there?

### Inputs:
table_name: table, columns: ['Call sign', 'Frequency', 'City of License', 'Licensee', 'Format']

### Response:
SELECT COUNT Call sign FROM table WHERE Frequency = 1180 AM