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:
| Date | Location | Winning team | Winning team | Losing team | Losing team | Notes |
| --- | --- | --- | --- | --- | --- | --- |
| November 12, 2006 | Christl Arena\n(West Point) | Pittsburgh men | 86 | Western Michigan men | 67 | PITT/WMU men's game; inaugural Maggie Dixon Classic |
| November 12, 2006 | Christl Arena\n(West Point) | Ohio State | 77 | Army | 41 | PITT/WMU men's game; inaugural Maggie Dixon Classic |
| December 8, 2007 | Madison Square Garden\n(New York City) | Duke | 51 | Pittsburgh | 49 | first Maggie Dixon Classic at Madison Square Garden |
| December 8, 2007 | Madison Square Garden\n(New York City) | Rutgers | 75 | Army | 68 | first Maggie Dixon Classic at Madison Square Garden |
| December 14, 2008 | Madison Square Garden\n(New York City) | Rutgers | 59 | Army | 38 | UConn - won National Championship |
| December 14, 2008 | Madison Square Garden\n(New York City) | Connecticut | 77 | Penn State | 63 | UConn - won National Championship |
| December 13, 2009 | Madison Square Garden\n(New York City) | Baylor | 68 | Boston College | 55 |  |
| December 13, 2009 | Madison Square Garden\n(New York City) | Tennessee | 68 | Rutgers | 54 |  |
| December 19, 2010* | Madison Square Garden\n(New York City) | Texas A&M | 79 | Rutgers | 50 | A&M - won National Championship; UConn - 88th Consecutive victory of a record 90 |
| December 19, 2010* | Madison Square Garden\n(New York City) | Connecticut | 81 | Ohio State | 50 | A&M - won National Championship; UConn - 88th Consecutive victory of a record 90 |
| December 11, 2011 | Madison Square Garden\n(New York City) | Baylor | 73 | St. Johns | 59 | Baylor - won National Championship; |
| December 11, 2011 | Madison Square Garden\n(New York City) | Tennessee | 84 | DePaul | 61 | Baylor - won National Championship; |
| December 9, 2012 | Madison Square Garden\n(New York City) | Rutgers | 73 | Louisiana Tech | 46 | LA Tech - won inaugural NCAA Championship |
| December 9, 2012 | Madison Square Garden\n(New York City) | Duke | 60 | St. Johns | 42 | LA Tech - won inaugural NCAA Championship |
| December 22, 2013 | Madison Square Garden\n(New York City) | St. Johns | 72 | Texas A&M | 70 |  |
| December 22, 2013 | Madison Square Garden\n(New York City) | Connecticut | 80 | California | 47 |  |
Question:
how many different teams have participated in the maggie dixon classic
Answer:
18