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){
	new Main().run();
    }
    Scanner sc = new Scanner(System.in);

    void run(){
	while(sc.hasNext()){
	    double a = sc.nextDouble();
	    solve(a);
	}
    }

    void solve(double a){
	double s = a;
	double prev = a;
	for(int i=2; i<11; i++){
	    if(i%2==0){
		s += prev*2;
		prev = prev*2;
	    }
	    else {
		s += prev/3;
		prev = prev/3;
	    }
	}
	System.out.println(s);
    }
}