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.util.Scanner;
class Main {
public static void main(String...args){
Scanner in = new Scanner(System.in);
while(in.hasNext()) {
double[] s = new double[10];
double a=in.nextDouble();
double ans=s[0]=a;
for(int i=1;i<10;i++){
if(i%2!=0) s[i]=s[i-1]*2;
else s[i]=s[i-1]/3;
ans+=s[i];
}
System.out.println(ans);
}
}
}