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 sc = new Scanner(System.in);
        long n = sc.nextInt();
        long m = sc.nextInt();
        long cuts = 0 ;
        if(n>m){
            cuts += m-1;
            cuts += (cuts+1 ) * (n-1);
        }
        else if(m>n){
            cuts += n-1;
            cuts += (cuts+1) * (m-1);
        }
        else if(m==n){
            cuts += m-1;
            cuts += (cuts+1)*(n-1);
        }
        System.out.println(cuts);
    }
}