# @param number int整型 
# @return int整型
class Solution:
    def jumpFloor(self , number: int) -> int:
        # write code here
        # f(n)=f(n-1)+f(n-2), 初始化f(0)=f(1)=1，后续根据公式计算
        a = 1 
        b = 1
        res = 1 
        for i in range(2, number+1):
            res = a + b
            a = b
            b = res
        return res