step = 1
step_point = 100000step = 2
step_point = 420000step = 3
step_point = 512000step = 4
step_point = 604000step = 5
step_point = 696000step = 6
step_point = 788000step = 7
step_point = 880000step = 8
step_point = 972000step = 9
step_point = 1064000step = 10
step_point = 1156000step = 11
step_point = 1248000step = 12
step_point = 1340000step = 13
step_point = 20000000