steps to heaven

ok so there is a blonde, brown, and a red head,and they want to get to heaven.there was 100,000 steps to heaven.So god told them he was going to tell them a joke on each step and if they laughed the couldn't go to heaven. So on the first step the brown head laughed on the 55,000th step the blonde laughed. on the 99,000th step the red head laughed before god told the joke then he asked why did you laugh i havent told the joke yet? then she said i just understould the first joke