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 scan=new Scanner(System.in);
	while(scan.hasNext())
	    {
	double a=scan.nextDouble();
	double b[]=new double[10];
	b[0]=a;
	double sum=0;
	for(int i=0;i<10;i++)
	    {
		if(i%2!=0 && i!=0)
		    {
			b[i]=b[i-1]*2;
		    }
		if(i%2==0 && i!=0)
		    {
			b[i]=b[i-1]/3;
		    }
		sum+=b[i];
	    }
	System.out.printf("%.8f\n",sum);
	    }
    }
}