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

# 题目：编写一个函数，输入n为偶数时，调用函数求1/2+1/4+...+1/n,
# 当输入n为奇数时，调用函数1/1+1/3+...+1/n

from functools import reduce

n=int(input("请输入n："))

OuMuShuList=[]
JiMuShuList=[]

if(n%2==0):
    for i in range(2,n+1):
        if(i%2==0):
            OuMuShuList.append(1/i)
    print("全部偶分母的分数：",OuMuShuList)
    print("全部偶分母分数之和：",reduce(lambda x,y:x+y,OuMuShuList))

elif(n%2!=0):
    for i in range(1,n+1):
        if(i%2!=0):
            JiMuShuList.append(1/i)
    print("全部奇分母的分数：",JiMuShuList)
    print("全部奇分母分数之和：",reduce(lambda x,y:x+y,JiMuShuList))