15 15
1 0 0 0 0 0 0 0 0 2 0 3 0 0 0
0 2 0 0 0 0 0 0 4 0 3 0 0 2 0
1 0 1 0 1 1 0 0 0 0 0 1 0 0 0
0 0 0 2 0 0 2 1 0 0 2 0 0 0 0
3 0 0 0 0 0 0 0 0 0 0 1 0 0 0
1 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 2 0 4 0 0 0 0 0 0 0 0 0 0
3 0 3 0 0 0 0 0 0 0 0 1 0 0 0
0 0 0 0 0 0 2 3 0 0 3 0 1 2 0
2 0 0 0 0 0 0 0 0 4 0 0 0 0 0
0 4 0 0 0 0 0 0 2 0 2 0 0 3 0
2 0 0 0 0 0 0 0 0 2 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 1 0 0 3 2
0 0 0 4 0 0 0 0 0 0 0 0 2 0 0
0 0 3 0 0 0 0 0 0 0 0 0 0 0 0