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

### Instruction:
What is the seat number when Series 3 shows Dana Bérová?

### Inputs:
table_name: table, columns: ['Seat', 'Series 1', 'Series 2', 'Series 3', 'Series 4']

### Response:
SELECT AVG Seat FROM table WHERE Series 3 = dana bérová