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 PYTHON):

Solution:
# -*- coding:utf-8 -*-

def solve(a):
	s = 0
	for _ in xrange(1, 11):
		s += a
		if _ % 2 == 1:
			a = a * 2.0
		else:
			a = a / 3.0
	print s

	
while True:
	try :
		a = float(raw_input())
		solve(a)
	except:
		break