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.*;
import java.util.StringTokenizer;
import java.math.BigDecimal;

class Main {
	public static void main (String args[]) {
		InputStreamReader isr = new InputStreamReader(System.in);
		BufferedReader br = new BufferedReader(isr);
		String buf;

		try {
			while ((buf = br.readLine())!=null) {
				BigDecimal a = new BigDecimal(buf);
				BigDecimal two = new BigDecimal("2.0");
				BigDecimal three = new BigDecimal("3.0");

				BigDecimal sum = new BigDecimal(buf);
				for (int i=2;i<=10;i++) {
					if (i%2==0) a = two.multiply(a);
					else a = a.divide(three,10,BigDecimal.ROUND_FLOOR);
					sum = sum.add(a);
				}
				System.out.println(sum.toString());
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}