#include <bits/stdc++.h>
#define ll long long
#define ull unsigned long long
#define mod 1e9
#define vll vector<ll>
#define pb push_back
#define what_is(x) cerr << #x << " is " << x << endl;
using namespace std;
inline void sol() {}
double exp(double a, long b) {
  double ans = 1;
  while (b != 0) {
    if (b % 2)
      ans = ans * a;
    a = a * a;
    b = b / 2;
  }
  return ans;
}
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(0);

  double x;
  cin >> x;
  if (x >= 20) {
    cout << 0 << endl;
    return 0;
  }
  double end = 1e7;
  if (x == 2) {
    ll ans = 1e6;
    cout << ans << endl;
    return 0;
  }

  double ans = 0;
  for (double i = 2; i <= end; i++) {
    ans += (exp(1.0 / i, 1 - x) / (i - 1.0)) * 1e6;
  }

  cout << trunc(ans) << endl;

  return 0;
}