Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Game | Date | Opponent | Score | High points | High rebounds | High assists | Location/Attendance | Record |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 30.0 | September 5 | Indiana | 90-68 | Pierson (20) | Pierson (6) | McWilliams-Franklin , Pierson (4) | Palace of Auburn Hills 9,287 | 18-12 |
| 31.0 | September 6 | @ Washington | 84-69 | McWilliams-Franklin (21) | Nolan (10) | Smith (8) | Verizon Center 9,976 | 19-12 |
| 32.0 | September 9 | Phoenix | 89-78 | Nolan (18) | Braxton , Hornbuckle , McWilliams-Franklin (8) | Pierson , Smith (5) | Palace of Auburn Hills 7,495 | 20-12 |
| 33.0 | September 11 | Washington | 78-66 | Nolan (17) | McWilliams-Franklin (8) | Smith (6) | Palace of Auburn Hills 8,145 | 21-12 |
| 34.0 | September 14 | @ New York | 61-59 | Nolan , Pierson (11) | Hornbuckle , Nolan (7) | Powell (4) | Madison Square Garden 10,042 | 22-12 |
Question:
What is the sum of Game(s), when High Rebounds is "Pierson (6)"?
Answer:
30.0