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 PYTHON3):

Solution:
from sys import stdin
def an(n ,a):
    if n == 1:
        return a
    if n % 2 == 0:
        return an(n - 1, a) * 2
    else:
        return an(n - 1, a) / 3
    
for line in stdin:
    a = float(line)
    print (sum([an(n,a) for n in range(1,11)]))