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);
			while(sc.hasNext()){
				double num = sc.nextDouble();
				double sum = num;
				for(int i = 0; i <9; i++){
					if(i%2==0){
						num = num *2;
					}else{
						num = num /3;
					}
					sum+=num;
				}
				
			System.out.println(sum);
			}
		}
	}