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

### Instruction:
What is the sum of the weight of the race with a 1st pos'n and a 8f distance?

### Inputs:
table_name: table, columns: ['Result', 'Race', 'Distance', 'Weight', 'Winner or 2nd', "Pos'n"]

### Response:
SELECT SUM Weight FROM table WHERE Pos'n = 1st AND Distance = 8f