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<iostream>
#include<stdio.h>
using namespace std;
int main(){
  double d;
  while(cin >> d){
    double a=d,b=0;
    for(int i=0;i<10;i++){
      b+=a;
      if(i%2==1) a/=3.0;
      else a*=2.0;
      //cout << a << endl;
    }
    //cout << b << endl;
    printf("%.10lf\n",b);
  }
}