#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;
  double ans = 0;
  for(double i=2;i<=1e7;i++){
    ans += (exp(1.0/i, 1-x)/(i-1.0))*1e6;
  }
  // ans = ans*1e6;
  ll o = (ll) ans;
  cout<<o;

  return 0;
}