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

### Instruction:
How many millions of U.S viewers are there when the director is andy wolk?

### Inputs:
table_name: table, columns: ['Series #', 'Title', 'Directed by', 'Written by', 'Original air date', 'Production code', 'U.S. viewers (million)']

### Response:
SELECT U.S. viewers (million) FROM table WHERE Directed by = Andy Wolk