Score : $100$ points

Problem Statement

In K-city, there are $n$ streets running east-west, and $m$ streets running north-south. Each street running east-west and each street running north-south cross each other. We will call the smallest area that is surrounded by four streets a block. How many blocks there are in K-city?

Constraints

• $2 \leq n, m \leq 100$

Input

Input is given from Standard Input in the following format:

$n$ $m$

Output

Print the number of blocks in K-city.

3 4

6

There are six blocks, as shown below:

2 2

1

There are one block, as shown below: