Problem: I have a sequence defined as follows:

* All even-numbered terms are equal to the previous term multiplied by 2.
* All odd-numbered terms are equal to the previous term divided by 3.



Create a program that reads the first term a of this sequence and outputs the sum s (10) from the first term to the tenth term.



Input

The input consists of multiple test cases. For each test case, a real number a (1.0 ≤ a ≤ 10.0) representing the first term of the sequence is given in one row.

The number of test cases does not exceed 50.

Output

Print s (10) on one line for each test case.

The output may contain an error of 0.000001 or less.

Example

Input

1.0
2.0
3.0


Output

7.81481481
15.62962963
23.44444444

Solution (in JAVA):

Solution:
import java.util.Scanner;

public class Main
{
  public static void main(String[] args)
  {
    try (Scanner scanner = new Scanner(System.in))
    {
      while (scanner.hasNextLine())
      {
        double a = Double.valueOf(scanner.nextLine());
        System.out.printf("%.8f\n", solver(a));
      }
    }
  }

  private static double solver(double a)
  {
    double ans = a;
    for (int i = 2; i <= 10; i++)
    {
      if (i % 2 == 0)
      {
        a *= 2.0;
      }
      else
      {
        a /= 3.0;
      }
      ans += a;
    }
    return ans;
  }
}