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.util.*;

class Main {

    static void solve (double f) {
        double [] seq = new double[10];
        seq[0] = f;
        for(int i = 1; i < 10; i++) {
            if (i % 2 == 0) seq[i] = seq[i-1] / 3;
            else            seq[i] = seq[i-1] * 2;
        }

        double sum = 0.0;
        for (int i = 0; i < 10; i++) {
            sum += seq[i];
        }

        System.out.println(sum);
    }

    public static void main (String [] args) {

        Scanner sc = new Scanner(System.in);

        while(sc.hasNext()) {
            double first = sc.nextDouble();
            solve(first);
        }

    }
}