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:
        a = float(input())
    except:
        break
    S = [a]
    for i in range(2,11):
        if i%2==0:
            Si = S[i-2] * 2
            S.append(Si)
        if i%2==1:
            Si = S[i-2] / 3
            S.append(Si)
    print(f'{sum(S):.6f}')