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;
double s;
s=0;
a=1;
s+=a;
for(int i=0;i<5;i++){
a*=2;
s+=a;
if(i==4)break;
a/=3;
s+=a;}
while(cin>>a){
a*=s;
if(a<10)printf("%10.8f\n",a);
if(a>=10)printf("%11.8f\n",a);}
}