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

### Instruction:
What's the sum of the Area (KM 2) that's got a Population that's smaller than 90?

### Inputs:
table_name: table, columns: ['Place', 'Code', 'Area (km 2 )', 'Population', 'Most spoken language']

### Response:
SELECT COUNT Area (km 2 ) FROM table WHERE Population < 90