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.*;
import static java.lang.System.*;

public class Main {
	static Scanner sc = new Scanner(System.in);
	public static void main(String[] args) {
		double[] ar = new double[10];
		
		while (sc.hasNext()) {
			ar[0] = sc.nextDouble();
			double total = ar[0];
			for (int i=1; i<=9; i++) {
				if (i%2==1) {
					ar[i] = ar[i-1]*2;
				}
				else {
					ar[i] = ar[i-1]/3;
				}
				total += ar[i];
			}
			out.println(total);
		}
	}
}