5 12
0 -1 0 1
0 0 0 2
1 -1 0 1
1 0 0 1
1 1 0 1
0 1 3 4
0 1 2 3
1 5 1 4
0 5 2 3
1 8 1 4
0 6 3 4
1 10 1 4