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.*;

public class Main{
	public static void main(String[] args){
		BufferedReader reader=new BufferedReader(new InputStreamReader(System.in));
		String s;
		double a;
		double ans;
		try{
			while((s=reader.readLine()) !=null){
				a=Double.parseDouble(s);
				ans=(1899*a)/243;
				System.out.println(ans);
			}
		}catch(IOException e){
			System.out.println(e);
		}
	}
}