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) {
		// TODO 自動生成されたメソッド・スタブ
		 Scanner sc = new Scanner(System.in);
		 double[] A=new double[11];
		while(sc.hasNext()){
			double sum=0;
			double a=sc.nextDouble();
			A[1]=a;
			for(int i=2; i<=10; i++){
				if(i%2==0){
					A[i]=2*A[i-1];
				}else{
					A[i]=A[i-1]/3.0;
				}
				
				
			}
			System.out.println(add(A));
		}
	}
	public static double add(double[] A){
		double sum=0;
		for(int i=1; i<=10; i++){
			sum+=A[i];
		}
		return sum;
	}


















	}