#include <bits/stdc++.h>
using namespace std;

signed main(){
  int N; cin >> N;
  double mafia = N;
  double not_mafia = 10000 - N;
  double ans = not_mafia * 0.01 / ( mafia * 0.99 + not_mafia * 0.01 );
  cout << fixed << setprecision( 13 ) << ans << endl;
  return 0;
}