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

### Instruction:
What is the sum of all silver medals with less than 23 medals in total and more than 3 bronze medals for the United States?

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

### Response:
SELECT SUM Silver FROM table WHERE Total < 23 AND Nation = united states AND Bronze > 3