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

struct Precision{
  Precision(){
    cout<<fixed<<setprecision(12);
  }
}precision_beet;

//INSERT ABOVE HERE
signed main(){
  double n;
  cin>>n;
  double AB=(10000-n)/10000*0.01;
  double A =(10000-n)/10000*0.01+n/10000*0.99;
  cout<<AB/A*100<<endl;
  return 0;
}