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

public class Solution {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        long n = in.nextLong();
        long m = in.nextLong();
        in.close();
        
        long cuts = 0;
        
        if(m>=n){
            cuts = (m-1) + ((n-1)*m);
        }
        else{
            cuts = (n-1) + ((m-1)*n);
        }
        
        System.out.print(cuts);
            
    }
}