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:
def sequence(x):
	A=[x]
	for i in range(1,10):
		if i%2:
			A.append(A[i-1]*2)
		else:
			A.append(A[i-1]/3)
	return sum(A)

while True:
	try:
		x=float(input())
		print(sequence(x))
	except EOFError:
		break