20
-7 -6 17 17
10 -5 16 16
-9 -20 -6 -14
-18 -2 -12 19
-6 9 -4 13
-2 8 19 9
-12 2 -3 10
-11 -17 8 -15
-8 -11 14 -2
-4 -17 20 8
-13 -17 -8 0
-20 -5 17 12
5 -8 6 -3
2 -14 8 -13
-10 -15 20 6
5 6 7 18
-1 4 17 10
16 -9 19 -8
10 -11 18 -9
-14 -17 -11 6