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 JAVA):

Solution:
import java.io.*;
import java.math.*;

class Main{
public static void main(String[] args) throws IOException{
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
String line="";
while((line=br.readLine())!=null){
double n=Double.parseDouble(line);
double sum=n;
for(int i=0;i<9;i++){
if(i%2==0){
n*=2;
}
else{
n/=3;
}
sum+=n;
}
BigDecimal x=BigDecimal.valueOf(sum);
x=x.setScale(8,BigDecimal.ROUND_HALF_UP);
System.out.println(x);
}
}
}