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[10];
  double s;
  int i;
  
  while(scanf("%lf",&a[0])!=EOF) {
 
    for(i=0;i<4;i++) {

      a[2*i+1]=2.0*a[2*i];
      a[2*i+2]=a[2*i+1]/3.0;
    
    }

    a[9]=2.0*a[8];
    
    s=0.0;
    
    for(i=0;i<10;i++) {
      
      s+=a[i];
      
    }
    
    printf("%.8lf\n",s);
    
  }

  return 0;

}