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

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