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

### Instruction:
What is the sum of silver values that have bronze values under 4, golds over 2, and a rank of 3?

### Inputs:
table_name: table, columns: ['Rank', 'Nation', 'Gold', 'Silver', 'Bronze', 'Total']

### Response:
SELECT SUM Silver FROM table WHERE Bronze < 4 AND Rank = 3 AND Gold > 2