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

### Instruction:
what is the minimum purse( $ ) where tournament is ko olina senior invitational

### Inputs:
table_name: table, columns: ['Date', 'Tournament', 'Location', 'Purse( $ )', 'Winner', 'Score', '1st Prize( $ )']

### Response:
SELECT MIN Purse( $ ) FROM table WHERE Tournament = Ko Olina Senior Invitational