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.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;


public class Main {

	/**
	 * @param args
	 * @throws IOException 
	 */
	public static void main(String[] args) throws IOException {
		// TODO Auto-generated method stub
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		
		while(true){
			String str = br.readLine();
			
			if(str == null){
				break;
			}
			
			double input = Double.parseDouble(str);
			
			Sequence sq = new Sequence(input);
			
			System.out.println(sq.sum(10));
		}
	}

}

class Sequence {
	private double[] seq = new double[11];
	
	public Sequence(double a){
		seq[1] = a;
		
		for(int i = 2; i <= 10; i++){
			if(i % 2 == 0){
				seq[i] = seq[i-1]*2;
			}
			else {
				seq[i] = seq[i-1]/3;
			}
		}
	}
	
	public double sum(int n){
		double sum = 0;
		for(int i = 1 ; i <= n && i < seq.length ; i++){
			sum += seq[i];
		}
		
		return sum;
	}
}