9

 0 0 0 0 0 0 0 0 0
 0 1 2 2 2 2 2 1 0
 0 0 1 0 0 0 1 0 0
 0 0 0 1 0 1 0 0 0
 0 2 0 0 1 0 0 2 0
 0 0 0 1 0 1 0 0 0
 0 0 1 0 0 0 1 0 0
 0 1 2 2 2 2 2 1 0
 0 0 0 0 0 0 0 0 0
