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

int main(){
  int n;
  cin >> n;
  int mafia = n * 100;
  int citizen = 1000000 - mafia;
  double arrested_mafia = mafia * 0.99;
  double arrested_citizen = citizen * 0.01;
  double ans = arrested_citizen / (arrested_mafia + arrested_citizen) * 100;
  printf("%.10f\n", ans);
}