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 CPP):

Solution:
#include <stdio.h>

int main(void)
{
	double a[16];
	int i;
	double total;
	
	while (scanf("%lf", &a[0]) != EOF){
		total = a[0];
		for (i = 1; i < 10; i++){
			if (i % 2 == 0){
				a[i] = a[i - 1] / 3;
			}
			if (i % 2 == 1){
				a[i] = a[i - 1] * 2;
			}
			total += a[i];
		}
		printf("%lf\n", total);
	}
	return (0);
}