import java.util.*;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    long D = sc.nextLong();
    D *= 108;
    String d = String.valueOf(D);
    String ans = d.substring(0, d.length() - 2) + "." + d.substring(d.length() - 2);
    System.out.println(ans);
  }
}