30-1

0 0
-1 0
1 0
-1 1
1 1
1 2
2 1
0 3
2 -1
2 2
-1 4
3 -2
3 -1
0 4
0 -1
3 0
0 1
2 -2
1 3
2 0
-2 2
-1 2
-3 2
-4 2
-3 1
-2 4
-4 1
4 -3
0 5
-1 3