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.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;


public class Main {
	private	static	BufferedReader	br = null;

	static {
		br = new BufferedReader(new InputStreamReader(System.in));
	}

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		String	strNum = null;
		double	s      = calcSum();
		while((strNum = parseStdin())!= null) {
			System.out.printf("%.8f\n", s * Double.parseDouble(strNum));
		}
	}

	private static double calcSum() {
		double	s = 1.0;
		double	d = 1.0;

		for(int i = 2; i <= 10; i++) {
			d  = (i % 2 == 0) ? d * 2: d / 3.0;
			s += d;
		}

		return s;
	}

	private static String parseStdin() {
		String	strNum = null;

		try {
			String line = br.readLine();
			if (line != null) {
				if (!line.isEmpty()) {
					strNum = line;
				}
			}
		}
		catch (IOException e) {}

		return strNum;
	}
}