
7 8
0   1  -3  -1  -2   0   0   0
1   0   1   0   0   0   0  -1
1   0  -1   0   0   2   1   0
1   0   0   1   0   0   0  -5
1   0   1  -1   0   0   1   1
1   0   0  -1   1   0   0   0
1   0   0   5  -1   1   0   2

E 3
P 2

N  M

