import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {

    public static void main(String[] args) {
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
  
    Scanner obj = new Scanner(System.in);
        int n=obj.nextInt();
        int m=obj.nextInt();
        if(n>1)
            n=n-1;
        if(m>1)
            m=m-1;
        System.out.println(m*n);
    }
}