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.*;

public class Main {
    public static void main(String[] args) {
        
        Scanner sc = new Scanner(System.in);
        while(true) {
            double a = 0;
            try {
                a = sc.nextDouble();
            }catch(Exception e) {
                break;
            }
            double sum = a;
            for(int i = 2; i <= 10; i++) {
                if(i % 2 == 0) {
                    sum += a * 2;  
                    a *= 2;
                }
                if(i % 2 == 1) {
                    sum += a / 3;
                    a /= 3;
                }
            }
            System.out.println(sum);
        }
    }
}