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.*;
import java.io.*;

class Main {

    public static void main(String[] args) {

	final Scanner stdin = new Scanner(System.in);

	while ( stdin.hasNextDouble() ) {

	    double a = stdin.nextDouble();
	    double sum = a;
	    for ( int i = 2; i <= 10; i++ ) {
		if ( i % 2 == 0 ) {
		    a *= 2; 
		} else {
		    a /= 3;
		}
		sum += a;
	    }
	    System.out.println( sum );	    
	}	
    }    
}