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

### Instruction:
What is the sum of Points, when Home is "Pittsburgh", when Date is "December 21", and when Attendance is greater than 5,307?

### Inputs:
table_name: table, columns: ['Date', 'Visitor', 'Score', 'Home', 'Attendance', 'Record', 'Points']

### Response:
SELECT SUM Points FROM table WHERE Home = pittsburgh AND Date = december 21 AND Attendance > 5,307