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:
//Volume0-0055
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {

		//declare
		final double EVEN = 0;
		      double a,sum,pre;

        //input
        Scanner sc = new Scanner(System.in);
        while((sc.hasNext())){
        	a = sc.nextDouble();

        	//calculate
        	sum = a;
        	pre = a;
        	for(int i=2;i<=10;i++){
        		if   (i%2 == EVEN){pre *= 2;}
        		else              {pre /= 3;}
        		sum += pre;
        	}

        	//output
        	System.out.println(sum);
        }
	}
}