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.*;

public class Main {

    public static void main(String[] argv) throws IOException {
        //*
        BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
        while (true) {
            String s = in.readLine();
            if (s == null) {
                break;
            }
            f(s);
        }
        //*/
    }

    public static void f(String s) {
        double a = 0;
        try {
            a = Double.parseDouble(s);
            if (a < 1.0 || 10.0 < a) {
                return;
            }
        } catch (NumberFormatException numberFormatException) {
            return;
        }
        double sum = a;
        for (int i = 2; i <= 10; i++) {
            if (i % 2 == 0) {
                a *= 2;
            } else {
                a /= 3;
            }
            sum += a;
        }
        System.out.printf("%.8f\n", sum);
    }
}