import java.util.*;

public class Exercise106{
  public static void main (String[] args){

    Scanner sc = new Scanner(System.in);

    double n = sc.nextDouble();
    double w = (1000000 - n * 100) / 100;
    double r = n * 100 * 99 / 100;
    double a = w + r;
    System.out.println(w / a * 100);
  }
}