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.*;

public class Main{
	public static void main(String[] args) throws IOException{
		Scanner stdIn = null;
		List<Double> result = new ArrayList<Double>();
		
		double mul = (double)211/27;
		
		try{
			stdIn = new Scanner(new BufferedReader(new InputStreamReader(System.in)));
			while( stdIn.hasNext() ){
				double a = stdIn.nextDouble();
				result.add(a*mul);
			}
			
			for(Double ans : result){
				System.out.printf("%.8f%n", ans);
			}
		} finally {
			if( stdIn != null ){
				stdIn.close();
			}
		}
	}
}