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 {

	public static void main(String[] args) throws IOException {

		BufferedReader br =
				new BufferedReader(new InputStreamReader(System.in));
		String line = "";

		while ((line = br.readLine()) != null) {
			double[] nums = new double[11];
			nums[1] = Double.parseDouble(line);
			for (int i = 2; i < nums.length; i++) {
				if (i % 2 == 0)
					nums[i] = nums[i - 1] * 2;
				else
					nums[i] = nums[i - 1] / 3.0;
			}
			double sum = 0;
			for (double d : nums)
				sum += d;
			System.out.println(sum);
			line = null;
		}

	}

}