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 CPP):

Solution:
#include<iostream>
#include <iomanip>

using namespace std;
int main()
{
  double s;

  for(;cin>>s;)
    {
  double sum=s;
  for(int i=2;i<=10;i++)
    {
      if(i%2==0)
	s*=2;
      else
	s/=3;
      sum+=s;
    }
   cout<< fixed << setprecision(8)<<sum<<endl;
    }
}