Problem:
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 ≤ n, m ≤ 100

Input

Input is given from Standard Input in the following format:

n m

Output

Print the number of blocks in K-city.

Sample Input 1

3 4

Sample Output 1

6

There are six blocks, as shown below:

Sample Input 2

2 2

Sample Output 2

1

There are one block, as shown below:

Solution in Java7 (OpenJDK 1.7.0) (judge verdict: Wrong Answer)

public class Main{
    public static void main(String[]args){
        int n = new java.util.Random().nextInt(97)+3;
        int m = new java.util.Random().nextInt(97)+3;
        int k= (n-1)*(m-1);
        System.out.print(k);
    }
}