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 s = new Scanner(System.in);
	while(s.hasNext()) {
	    double[] out = new double[10];
	    out[0] = s.nextDouble();
	    double sum = out[0];
	    for(int i=1 ; i<10 ; i++) {
		if((i+1)%2==0) {
		    out[i] = out[i-1]*2;
		} else {
		    out[i] = out[i-1]/3;
		}
		sum+=out[i];
	    }
	    System.out.println(sum);
	}
    }
}