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;

public class Main {
	static Scanner sc =  new java.util.Scanner(System.in);

	public static void main(String[] args) {
		
		
		while ( sc.hasNext() ){
		
		double a = sc.nextDouble();
		
		double a2 = a * 2 ;
		double a3 = a2 / 3 ;
		double a4 = a3 * 2 ;
		double a5 = a4 / 3 ;
		double a6 = a5 * 2 ;
		double a7 = a6 / 3 ;
		double a8 = a7 * 2 ;
		double a9 = a8 / 3 ;
		double a10 = a9 * 2 ;
		
		double s = a + a2 + a3 + a4 + a5 + a6 + a7 + a8 + a9 + a10 ;
		
		System.out.println( s );
	
		}
	}

}