using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
class Solution {

    int NumberOfCuts(int n, int m)
        {
        
        int cuts= (n-1) + n*(m-1);
        return cuts;
    }
    
    static void Main(String[] args) {
        string[] tokens_n = Console.ReadLine().Split(' ');
        int n = Convert.ToInt32(tokens_n[0]);
        int m = Convert.ToInt32(tokens_n[1]);
        
        Solution s = new Solution();
        int cuts=  s.NumberOfCuts(n,m);              
                    
        Console.WriteLine(cuts);
    }
}