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

### Instruction:
Name the total number of ERP W when the call sign is w217bf

### Inputs:
table_name: table, columns: ['Call sign', 'Frequency MHz', 'City of license', 'ERP W', 'FCC info']

### Response:
SELECT COUNT ERP W FROM table WHERE Call sign = w217bf