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{
    private static double calculation(double value){
	double sum = value;
	double[] values = new double[10];
	values[0] = value;
	
	for(int i = 1; i < 10; ++i){
	    if(i%2 == 1){
		values[i] = values[i-1]*2.0;
	    } else {
		values[i] = values[i-1]/3.0;
	    }
	    sum += values[i];
	}
	

	return sum;
    }
    
    public static void main(String[] args){
	Scanner sc = new Scanner(System.in);
	
	while(sc.hasNext()){
	    double value = sc.nextDouble();
	    System.out.printf("%f\n", calculation(value));
	}
    }
}