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.*;
public class Main {

	    public static void main(String[] args) throws java.io.IOException{
	        Scanner scan = new Scanner(System.in);
	        while(scan.hasNext()){
	        	
	        	Double a=scan.nextDouble();
	        	System.out.printf("%.8f\n",ss(a,1));
	        	
	        	
	        }
	    }
	    public static double ss(double a,int c){
	    	if(c==11)return 0;
	    	if(c%2==0){
	    		return a+ss(a/3,c+1);
	    	}
	    	else {
	    		return a+ss(a*2,c+1);
	    	}
	    }
}