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.math.BigInteger;
import java.util.*;
import static java.util.Arrays.*;
import static java.lang.Math.*;

// AOJ 0055
public class Main {

	static Scanner sc = new Scanner(System.in);
	public static void main(String[] args) {
		while (sc.hasNextDouble()) {
			double a = sc.nextDouble(), res = 0.0;
			res = a;
			for (int i = 2; i <= 10; i++) {
				if (i % 2 == 0) {
					a *= 2;
				} else {
					a /= 3;
				}
				res += a;
			}
			System.out.printf("%.9f", res);
			System.out.println();
		}
	}	
}