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

### Instruction:
What is the lowest episode number where john bird was the 4th performer?

### Inputs:
table_name: table, columns: ['Date', 'Episode', 'Performer 1', 'Performer 2', 'Performer 3', 'Performer 4']

### Response:
SELECT MIN Episode FROM table WHERE Performer 4 = john bird