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.*;
/**
 * @author afterCmidday
 *
 */
class Main {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ
		Scanner scan = new Scanner(System.in);
		while(scan.hasNextDouble()){
			double a = scan.nextDouble(), ans = a;
			for(int i = 0;i < 4;i++){
				a *= 2;
				ans += a;
				a /= 3;
				ans += a;
			}
			a *= 2;
			ans += a;
			System.out.println("" + ans);
		}
		
	}

}