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.Scanner;

public class Main {
    public static void main(String[] args){
    	Scanner input = new Scanner(System.in);
    	while(input.hasNext()){
    		double a = input.nextDouble();
    		System.out.println(doub(a));
    	}
    }
    
    public static double doub(double a){
    	double sum = a;
    	double nownum = a;
    	for(int i = 2 ; i <= 10 ; i++){
    		if(i % 2 == 0){
    			nownum *= 2;
    			sum += nownum;
    		}else{
    			nownum /= 3;
    			sum += nownum;
    		}
    	}
    	return sum;
    }
}