19
-20.4  -20.0
-10.0  -10.0
-0.34  -0.34
9.87   9.78
18.99  20.0
19.00  10.0
19.01  0.0
19.00  -10.0
18.99  -20.0
15.0   -15.0
10.0   -10.0
5.0   -5.0
0.0   0.234
-5.0  3.46
-10.45  8.99
-15.33  12.89
-17.89  15.66
-18.01  18.55
-20.04  20.0