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.BufferedReader;
import java.io.InputStreamReader;
import java.math.BigDecimal;
 

 class Main{
             
     public static void main(String args[]){
         BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
         
         try{
             String line;
             while((line=br.readLine())!= null){if(line.isEmpty())break;
                String[] spli=line.split(" ");
                double d=Double.parseDouble(line);
                
                double sum=d;
                for(int i=0;i<9;i++){
                    d=(i%2==0)? d*2 :d/3;sum+=d;
                }
                 System.out.println(sum);
                
                 
                 
             }
             
         }catch(Exception e){}         
     }
     
     
    
 }