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>
double r(double b,int i,double sum){
  if(i==11)return sum;
  if(!(i%2))b*=2;
  else{b/=3;}
  return r(b,i+1,sum+b);
}
int main(){
  double n;
  while(std::cin>>n){
    if(std::cin.eof())break;
    std::cout<<std::fixed<<std::setprecision(8)<<r(n,2,n)<<std::endl;
  }
  return 0;
}