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>

using namespace std;

int main(){
   double a;
   while(cin >> a){
      double s = a;
      for(int i=2;i<11;i++){
	 if (i % 2) a /= 3;
	 else  a *= 2;
	 s += a;
      }
      cout.precision(8);
      cout << fixed << s << endl;         
   }
   return 0;
}