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

### Instruction:
What is the lowest population of alessandria where the altitude is less than 197 and density is less than 461.8?

### Inputs:
table_name: table, columns: ['Rank', 'City', 'Population', 'Area (km 2 )', 'Density (inhabitants/km 2 )', 'Altitude (mslm)']

### Response:
SELECT MIN Population FROM table WHERE Altitude (mslm) < 197 AND City = alessandria AND Density (inhabitants/km 2 ) < 461.8