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

### Instruction:
How many starts are associated with an oldsmobile engine, 21 finishes and before 2001?

### Inputs:
table_name: table, columns: ['Year', 'Chassis', 'Engine', 'Start', 'Finish', 'Team']

### Response:
SELECT SUM Start FROM table WHERE Engine = oldsmobile AND Finish = 21 AND Year < 2001