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

### Instruction:
What is the number when against is rajasthan royals?

### Inputs:
table_name: table, columns: ['No.', 'Season', 'Bowler', 'Batsmen', 'For', 'Against', 'Ground', 'Scorecard']

### Response:
SELECT MAX No. FROM table WHERE Against = Rajasthan Royals