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 <cstdio>
#include <iostream>

using namespace std;

double data[10];
double n;
double ans=0;

int main(){
	while(cin >> n){
		ans = 0;
		data[0] = n;
		for(int i=1;i<10;i++){
			if((i+1)%2 == 0){
				data[i] = data[i-1] * 2;
			}else{
				data[i] = data[i-1] / 3;
			}
		}

		for(int i=0;i<10;i++)ans += data[i];

		printf("%0.8lf\n",ans);
	}
}