# -*- coding:utf-8 -*-
class Solution:
    def jumpFloor(self, number):
        # write code here
        n = number
        if n <=2:
            return n
        dp_1 = 1
        dp_2 = 2
        for i in range(3, n+1):
            dp = dp_1 + dp_2
            dp_1 = dp_2
            dp_2 = dp
        return dp