9

 3 3 3 3 3 3 3 3 3
 3 3 3 3 3 3 3 3 3
 3 3 3 3 3 3 3 3 3
 3 3 3 3 3 3 3 3 3
 3 3 3 3 3 3 3 3 3
 0 0 0 0 0 0 0 0 0
 2 2 2 2 2 2 2 2 2
 1 1 1 1 1 1 1 1 1
 0 0 0 0 0 0 0 0 0
