10
0 0 0    20 30 60
0 0 0    120 80 10
0 0 0    -20 330 -50
0 0 0    40 230 40
0 0 0    80 130 -30
0 0 0    -20 -30 -60
0 0 0    50 -230 -160
0 0 0    90 -190 10
0 0 0    -80 -30 120
0 0 0    40  130 80