# _*_ coding:utf-8 _*_

import numpy as np

def jie(i):
    s = 1
    for j in range(1, i+1):
        s = s * j
    return s


x = int(input("請輸入x="))
n = int(input("請輸入n="))
s = 1
for i in range(1, n+1):
    s = s+np.power(x, i)/jie(i)
print(s)

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