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 EOFError :
        break
    
    S = []
    S.append(0)
    S.append(a)
    for i in range(2, 11) :
        if i % 2 == 0 :
            S.append(S[i-1] * 2)
        else :
            S.append(S[i-1] / 3)
    print(sum(S))