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>
#include <iostream>
using namespace std ;

double calc( int cnt , double N ){
	if( cnt == 11 ) return 0;
	else return N + calc( cnt+1 , N / ( (cnt%2)?0.5:3.0 ) ) ;
}

int main(){
	
	double D;
	
	while( cin >> D ){
		if( cin.eof() ) break ;
		printf("%.8lf\n",calc(1,D));
	}
	
	return 0;
}