8
 1 2 2 2 1 1 0 1
 2 1 3 2 2 2 1 2
 2 3 1 2 2 2 3 3
 2 2 2 1 1 1 0 0
 1 2 2 1 1 1 1 1
 1 2 2 1 1 1 1 1
 0 1 3 0 1 1 1 2
 1 2 3 0 1 1 2 1