代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可

@param number int整型

@return int整型

class Solution: memn = {} def jumpFloor(self , number: int) -> int:

    n = number
    if n in self.memn.keys():
        return self.memn[n] 
    if n <=3:
        return n
    self.memn[n] = self.jumpFloor(n-1) + self.jumpFloor(n -2)
    return self.memn[n]