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 <math.h>

int main(void){
    double a,sum;
    
    while (scanf("%lf", &a)!=EOF){
        sum=0;
        for(int i=1; i<=10; i++){
            sum+=a;
      //      printf("%2d:%8f (sum:%.6f)\n",i,a,sum);
            if (i%2) a *= 2;
            else a /= 3;
        }
        printf("%f\n",sum);
    }
    return 0;
}