15 15
0 2 0 0 0 0 0 0 0 0 3 0 0 0 0
2 0 0 1 4 0 2 0 3 2 0 0 0 0 0
0 0 0 1 0 0 2 0 4 0 0 0 3 0 0
0 1 1 0 0 0 0 0 0 0 0 2 0 0 0
0 4 0 0 0 3 0 2 0 0 4 4 0 0 0
0 0 0 0 3 0 0 0 1 2 0 0 0 5 0
0 2 2 0 0 0 0 2 0 0 0 1 0 0 0
0 0 0 0 2 0 2 0 0 0 0 0 0 0 4
0 3 4 0 0 1 0 0 0 0 0 0 0 0 0
0 2 0 0 0 2 0 0 0 0 2 3 0 0 0
3 0 0 0 4 0 0 0 0 2 0 0 0 1 0
0 0 0 2 4 0 1 0 0 3 0 0 3 0 0
0 0 3 0 0 0 0 0 0 0 0 3 0 0 0
0 0 0 0 0 5 0 0 0 0 1 0 0 0 0
0 0 0 0 0 0 0 4 0 0 0 0 0 0 0