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.io.*;
class Main {
  public static void main (String[] args) throws Exception {
    BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
    String s;
    while(null != (s = in.readLine()))
      calc(Double.parseDouble(s));
  }
  private static void calc(double a){
    double sum = 0;
    for(int i=0;i<10;i++){
      sum+=a;
      a=((i&1)==0)?a*2.0:a/3.0;
    }
    System.out.println(sum);
  }
}