#include <bits/stdc++.h>

using namespace std;

#define REP(i,n) for(int i=0; i<(int)(n); i++)

int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);

  int n;
  cin >> n;

  double p = 0.99;
  double black = n / 10000.0;
  double white = 1.0 - black;

  double ret = white * (1-p) / (white * (1-p) + black * p);
  cout << fixed << setprecision(15) << 100 * ret << endl;
  
  return 0;
}