import java.io.*;
import java.util.*;

public class Solution {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        long n = sc.nextLong();
        long m = sc.nextLong();
        long cuts;
        if (n >= m){
             cuts = (long) (m-1) + m*(n-1);
        }else{
             cuts = (long) (n-1) + n*(m-1);
        }
        System.out.println( cuts );
    }
}