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

### Instruction:
What is the sum of the weeks on a chart a song with a position less than 1 haas?

### Inputs:
table_name: table, columns: ['Year', 'Single', 'Chart', 'Position', 'Weeks on chart']

### Response:
SELECT SUM Weeks on chart FROM table WHERE Position < 1