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>

double a[11];

int main()
{
	while( scanf( "%lf", &a[1] ) != EOF ){
		double ans = a[1];
	
		for( int i = 2; i <= 10; i++ ){
			if( i % 2 == 0 ){
			 	a[i] = a[i-1] * 2.0;
			}
			else{
			 	a[i] = a[i-1] / 3.0;
			}
			
			ans += a[i];
		}
		
		printf( "%.8f\n", ans );
	}

 	return 0;
}