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 PYTHON):

Solution:

import sys


def solv(i):
    r = 0.0
    j = 0
    for k in seq(i):
        j += 1
        if 10 < j:
            break
        else:
            r += k
    return r


def seq(init):
    s = []
    s.append(init)
    yield(init)
    while True:
        x = s[-1] * 2.0
        s.append(x)
        yield x
        y = s[-1] / 3.0
        s.append(y)
        yield y


for line in sys.stdin:
    i = float(line)
    print solv(i)