#include <iostream>
#include <iomanip>
using namespace std;

int main(){
  double n,a,b,c,d,e,p,q,x;
  cin>>n;
  a=1000000;
  b=n*100;
  c=a-b;
  p=0.99;
  q=1;
  d=b*p;
  e=c*(1-p);
  x=e/(d+e)*100;
  cout<<fixed<<setprecision(3)<<x<<endl;
  return 0;
}