using System;
using System.Collections.Generic;
using System.IO;
class Solution {
    static void Main(String[] args) {                
        var input = Console.ReadLine().Split(' ');
        var n = Convert.ToInt32(input[0]);
        var m = Convert.ToInt32(input[1]);
        
        var pieces = 1;
        
        var horizontalCuts = (n > 1 ? n - 1 : 0);
        pieces += horizontalCuts;
        var verticalCuts = (m > 1 ? (m - 1) * pieces : 0);
        
        Console.WriteLine(horizontalCuts + verticalCuts);
    }
}