#!/usr/bin/env python3
#coding:utf-8

import math
import string
import random
import heapq
from sys import stdin
# import numpy as np
# from matplotlib import pyplot as plt

def main():
	read=stdin.readline

	#edit here!
	x=int(read())
	ans=0
	
	for i in range(2,1000000):
		res=0
		res+=math.pow(i,1-x)

		res/=i-1
		ans+=res

	ans*=1000000
	ans=int(ans)
	print(ans)
if __name__ == '__main__':
	main()