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) {
	Scanner cin = new Scanner(System.in);
	while(true){
		if(!cin.hasNext()){
			break;
		}
		double x,ans;
		x=cin.nextDouble();
		ans=x;
		for(int i=2;i<11;i++){
			if(i%2==0){
				x=x*2;
				ans=ans+x;
			}
			else{
				x=x/3;
				ans=ans+x;
			}
		}
		System.out.println(ans);
	}
	}

}