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.*;

//素数探索系 cf p0009
//素数を各々取得するのでArrayListでデータを取得するのがよい。
//データを挿入する時には、LinkedListの方が早いので途中でコピーするのもあり。

class Main {
	Scanner sc = new Scanner(System.in);

	public void run() {
		while(sc.hasNext()){
			double n=sc.nextDouble();
			double sum=n;
			for(int i=2;i<=10;i++){
				if(i%2==0){
					n*=2;
				}else{
					n/=3;
				}
				sum+=n;
			}
			ln(sum);
		}
	}

	public static void main(String[] args) {
		new Main().run();
	}

	public static void pr(Object o) {
		System.out.print(o);
	}

	public static void ln(Object o) {
		System.out.println(o);
	}

	public static void ln() {
		System.out.println();
	}
}