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:
while True:
    try:
        f = float(input())
    except:
        break
    l = [0] * 11
    l[1] = f
    for i in range(2,11):
        if i % 2 == 0:
            l[i] = l[i-1] * 2
        else:
            l[i] = l[i-1] / 3

    print(sum(l))