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

### Instruction:
What is the sum of Round, when Nationality is "United States", and when Pick is "125"?

### Inputs:
table_name: table, columns: ['Round', 'Pick', 'Player', 'Nationality', 'School/Club Team']

### Response:
SELECT SUM Round FROM table WHERE Nationality = united states AND Pick = 125