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

### Instruction:
How much Population (2011) has a Land area (km²) larger than 15.69, and a Population density (per km²) larger than 57.3?

### Inputs:
table_name: table, columns: ['Name', 'Population (2011)', 'Population (2006)', 'Change (%)', 'Land area (km²)', 'Population density (per km²)']

### Response:
SELECT SUM Population (2011) FROM table WHERE Land area (km²) > 15.69 AND Population density (per km²) > 57.3