bad step: x=0
bad step: x=0
bad step: x=0
bad step: x=1.85401830144469
bad step: x=1.90683200714501
bad step: x=1.95278596269134
bad step: x=1.99497254606742
bad step: x=2.03405042380771
bad step: x=2.0685174086282
bad step: x=2.91061876131066
bad step: x=2.96687352476884
bad step: x=2.96687352476884
bad step: x=3.01023928990354
bad step: x=3.53486417488832
bad step: x=3.53486417488832
bad step: x=3.59828275093463
bad step: x=3.65214482060163
bad step: x=3.74563263001918
bad step: x=3.78735443375853
bad step: x=3.82531071519998
bad step: x=4.99660481369687
bad step: x=5.0512992108742