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

### Instruction:
How many destinations have a weekly frequency and are named AC Express?

### Inputs:
table_name: table, columns: ['Train No.', 'Train Name', 'Destination', 'Category', 'Frequency']

### Response:
SELECT COUNT Destination FROM table WHERE Frequency = Weekly AND Train Name = AC Express