100 20 1000
F 0 0
F 0 0
F 0 0
F 0 0
F 0 0
F 0 0
F 0 0
F 0 0
F 0 0
F 0 0
F 0 0
F 0 0
F 0 0
F 0 0
F 0 0
F 0 0
F 0 0
F 0 0
F 0 0
F 0 0