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.io.*;
import java.util.*;

class Main{
    public static void main(String[] args){
	BufferedReader sc=new BufferedReader(new InputStreamReader(System.in));
	try {
	    String st;
	    while((st=sc.readLine())!=null){
		double s, now, n = Double.valueOf(st);
		s = n; now = n;
		for(int i=2; i<=10; i++){
		    if(i%2==0)
			now *= 2;
		    else
			now /= 3;
		    s+=now;
		}
		System.out.println(s);
	    }
	}catch(Exception e){
	    System.out.println("Error");
	}
    }
}