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

### Instruction:
What is the density of San Sebastián?

### Inputs:
table_name: table, columns: ['City district', 'Area km²', 'Population 2007 census(hab)', 'Housing (2007)', 'Density (hab/km²)', 'Elevation msl']

### Response:
SELECT Density (hab/km²) FROM table WHERE City district = san sebastián