5

-1 2    5
1 1 1 1 1
1 2 0 1

1 2     4
1 1 1 1
1 2 1

1 2     4
0 0 0 0
0 0 0

0 0     1
4
5

-1 2    5
1 1 1 1 1
1 2 0 1

1 2     4
1 1 1 1
1 2 1

1 2     4
0 0 0 0
0 0 0

0 0     1
4