// g++ A.cpp -std=c++14 -I . && ./a.out
#include <bits/stdc++.h>
using namespace std;
#include <cmath>
// #include <atcoder/all>
// using namespace atcoder;
// using mint = modint1000000007;
// using mint = modint998244353;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define rep2(i, a, b) for (int i = a; i < (int)(b); i++)
#define rrep(i, a, b) for (int i = a; i > (int)(b); i--)
#define all(v) v.begin(), v.end()
using ll = long long;
const ll INF = 1e18;
// 変数定義
ll N, M, Q, a, b, c, d, e, x, y, t, T, total, cnt;
long double ans;
int main()
{
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
  cin >> N;
  rep2(i, x, 10001)
  {
    ans += riemann_zeta(i) * 1e6;
  }
  ans = int(ans);
  return 0;
}