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:
| School | Team Name | Town | County | Enrollment (2010-11 & 2011–12) | Primary MSHSAA class* | Football class |
| --- | --- | --- | --- | --- | --- | --- |
| Benton High School | (Lady) Cardinals | St. Joseph | Buchanan | 846 | 4 | 4 |
| Bishop LeBlond High School | (Lady) Golden Eagles | St. Joseph | Buchanan | 314 | 3 | 2 |
| Cameron High School | (Lady) Dragons | Cameron | Clinton | 503 | 3 | 3 |
| Chillicothe High School (Missouri) | (Lady) Hornets | Chillicothe | Livingston | 638 | 4 | 3 |
| Lafayette High School | Fighting Irish | St. Joseph | Buchanan | 801 | 4 | 4 |
| Maryville High School | (Lady) Spoofhounds | Maryville | Nodaway | 473 | 3 | 2 |
| Savannah High School | (Lady) Savages | Savannah | Andrew | 743 | 4 | 4 |
| Smithville High School | (Lady) Warriors | Smithville | Clay | 727 | 4 | 4 |
Question:
how many of the schools had at least 500 students enrolled in the 2010-2011 and 2011-2012 season?
Answer:
6