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

### Instruction:
Which sum of Seasons in league has a Best Position of 5th (2007)?

### Inputs:
table_name: table, columns: ['Pos. in 2007', 'Club', 'City', 'Best Position', 'Seasons in league']

### Response:
SELECT SUM Seasons in league FROM table WHERE Best Position = 5th (2007)