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

### Instruction:
How many next in lines had heirs of Archduke Karl?

### Inputs:
table_name: table, columns: ['Emperor', 'Heir', 'Relationship to emperor and status', 'Became heir', 'Ceased to be heir', 'Next in line']

### Response:
SELECT COUNT Next in line FROM table WHERE Heir = Archduke Karl