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 a[2];
    while(cin>>a[0]){
        int co=1;
        double ans=0;
        while(co<11){
            if(co%2)a[co%2]=a[(co%2+1)%2]*2;
            else a[co%2]=a[(co%2+1)%2]/3;
            ans+=a[(++co)%2];
        }
        printf("%.7f\n",ans);
    }
}