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(void){
   double a;
   
   while(cin>>a){
       double b=0,c=0;
       b=a;
       c+=a;
       for(int i=2;i<=10;i++){
           if(i%2==0) b*=2;
           else if(i%2==1) b/=3;
           c+=b;
       }
       cout<<fixed<<c<<endl;
       
   }
   
    return 0;
}