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 $b$.

Input is given from Standard Input in the following format:
$S$

Print the answer.

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.

21

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