8
0 0 1 0 5 0 7 0
0 0 0 0 1 0 0 8
0 3 0 0 0 0 0 0
0 1 0 0 0 4 0 7
0 0 1 1 0 9 3 0
0 0 0 0 0 0 0 2
0 0 0 2 2 4 0 0
0 0 0 0 0 1 0 0