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

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 sum = 0;
            double[] arr = new double[10];
            arr[0] = Double.parseDouble(line);
            sum += arr[0];
            for (int i = 1; i < 10; i++) {
                if (i % 2 == 0) {
                    arr[i] = arr[i - 1] / 3;
                } else {
                    arr[i] = arr[i - 1] * 2;
                }
                sum += arr[i];
            }
            System.out.printf("%.8f%n", sum);
        }
    }
}