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 JAVA):

Solution:
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc=new Scanner(System.in);
		double s,n,k[]=new double[11];
		int i;
		while(sc.hasNext()){
			n=sc.nextDouble();
			s=0;
			k[0]=0;
			k[1]=n;//
			for(i=2;i<11;i++){
				if(i%2==0){
					k[i]=k[i-1]*2;
				}
				else{
					k[i]=k[i-1]/3.0;
				}
			}//for
			for(i=1;i<11;i++){
				s+=k[i];
			}
			System.out.printf("%.8f\n",s);
		}
	}
}