8 20 7
1 1 1 1 1 6 6 1 6 5 3 2 7 6 1 4 4 2 4 3
0 0 0 0 7 2 0 0
0 0 0 0 0 0 4 0
0 0 6 0 0 0 0 0
0 0 0 0 6 0 6 0
0 0 0 0 0 5 0 0
4 0 0 0 0 0 2 4
0 0 3 0 1 0 0 0
1 0 0 3 0 0 6 0
