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;

class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    while(sc.hasNext()) {
      double[] a = new double[10];
      a[0] = sc.nextDouble();
      for(int i=1; i<10; i++) {
        if(i % 2 == 0) {
	  a[i] = a[i-1]/3;
        }
	else {
          a[i] = a[i-1]*2;
        }
      }
      double s=0;
      for(int i=0; i<10; i++) {
        s+=a[i];
      }
      System.out.println(s);
    }
  }
}