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

### Instruction:
What's the sum of all values in category 1 when category 3 is equal to 300?

### Inputs:
table_name: table, columns: ['Method of administration[ citation needed ]', 'Category 1', 'Category 2', 'Category 3', 'Category 4', 'Category 5']

### Response:
SELECT SUM Category 1 FROM table WHERE Category 3 = 300