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

### Instruction:
Which Size has an IHSAA Class of aa, and a Location of milan?

### Inputs:
table_name: table, columns: ['School', 'Location', 'Mascot', 'Size', 'IHSAA Class', 'County']

### Response:
SELECT SUM Size FROM table WHERE IHSAA Class = aa AND Location = milan