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 CPP):

Solution:
#include <stdio.h>
#define rep(i, n) for (int i = 0; i < (int)(n); i++)

int main() {
    double a[16];
    while (scanf("%lf", a) != EOF) {
        rep (i, 10) a[i+1] = i%2 ? a[i]/3 : a[i]*2;
        double ans = 0;
        rep (i, 10) ans += a[i];
        printf("%.8f\n", ans);
    }
    return 0;
}