2018-07-04

n =input("输入一个数：")

n =int(n)

sum =1/n

x =2

y =1

while x < n:

if n %2 ==0:

sum = sum + (1/x)

x+=1

        print(sum)

break

    elif n %2 !=0:

sum = sum + (1/y)

y +=1

        print(sum)

break