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

### Instruction:
how many guest stars did the episode that was broadcasted 11september2012 have

### Inputs:
table_name: table, columns: ['Episode', 'Broadcast date', 'Guest(s)', 'Singer(s)', 'Ratings']

### Response:
SELECT COUNT Guest(s) FROM table WHERE Broadcast date = 11September2012