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

### Instruction:
How many Horsepowers have a Year smaller than 1974, and a Tonnage of 4437?

### Inputs:
table_name: table, columns: ['Name', 'Length', 'Tonnage', 'Built by', 'Year', 'Engines', 'Horsepowers', 'Former Names']

### Response:
SELECT SUM Horsepowers FROM table WHERE Year < 1974 AND Tonnage = 4437