Problem Statement

You are given a $3$-character string $S$, which is a concatenation of integers $a$ and $b$ between $1$ and $9$ (inclusive) and the character x in this order: axb.

Find the product of $a$ and $b$.

Constraints

• The length of $S$ is $3$.
• The $1$-st and $3$-rd characters are digits between $1$ and $9$ (inclusive).
• The $2$-nd character is x.

Input

Input is given from Standard Input in the following format:

$S$

Output

Print the answer.

Sample Input 1

3x7

Sample Output 1

21

We have $3 \\times 7 = 21$, which should be printed.

Sample Input 2

9x9

Sample Output 2

81

Sample Input 3

1x1

Sample Output 3

1