21 9
1 4 0
-1 -4 0
-1 -7 0
-4 -7 0
2 8 0
-2 -5 0
-2 -8 0
-5 -8 0
3 9 0
-3 -6 0
-3 -9 0
-6 -9 0
-1 -2 0
-4 -5 0
-7 -8 0
-2 -3 0
-5 -6 0
-8 -9 0
-3 -1 0
-6 -4 0
-9 -7 0