/* -*- coding: utf-8 -*-
 *
 * 1273.cc:  No.1273 はじめのζ関数 - yukicoder
 */

#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<iostream>
#include<string>
#include<vector>
#include<map>
#include<set>
#include<stack>
#include<list>
#include<queue>
#include<deque>
#include<algorithm>
#include<numeric>
#include<utility>
#include<complex>
#include<functional>
 
using namespace std;

/* constant */

const int N = 8000;

/* typedef */

typedef long long ll;

/* global variables */

double zeta(int n) {
  double sum = 0.0;
  for (int i = N; i >= 1; i--) sum += pow(1.0 / i, n);
  return sum;
}

/* subroutines */

/* main */

int main() {
  int x;
  scanf("%d", &x);

  double sum = 0.0;
  for (int i = N; i >= x; i--)
    sum += zeta(i) - 1.0;

  printf("%d\n", (int)(sum * 1000000));
  return 0;
}