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.text.NumberFormat;
import java.util.Scanner;

public class Main
{
	public static void main(String arg[])
	{
		Scanner sc = new Scanner(System.in);
		while(sc.hasNext())
		{
			double n = sc.nextDouble();
			double ans =0;

			double a[]= new double[11];
			a[1]=n;
			for(int i=2; i<=10; i++)
			{
				if(i%2==0)
					a[i] = a[i-1]*2;
				else
					a[i]= a[i-1]/3;
			}
			for(int i=1; i<=10; i++)
				ans+=a[i];

			NumberFormat d = NumberFormat.getInstance();
			d.setMaximumFractionDigits(8);
			System.out.println(d.format(ans));
		}
	}

}