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

### Instruction:
Name number of stellar classification for 3 neptune planets < 1 au

### Inputs:
table_name: table, columns: ['Star', 'Stellar classification', 'Distance from Earth ( ly )', 'Constellation', 'Dust (or Debris; Temperature (K)', 'System', 'Dust (or Debris) Location (AU)', 'Cool Dust > 10 AU', 'Stellar Age (Myr)']

### Response:
SELECT COUNT Stellar classification FROM table WHERE System = 3 Neptune planets < 1 AU