using System;
using System.Collections.Generic;
using System.IO;
class Solution {
    static void Main(String[] args) {
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution */
        string[] inputs = Console.ReadLine().ToString().Split(' ');
        int n= Convert.ToInt32(inputs[0]);
        int m=Convert.ToInt32(inputs[1]);
        int columnCuts = 0, rowCuts=0;
        if(m>=2){
            columnCuts = m-1;
        }
        if(n>=2){
            rowCuts=n-1;
        }
        long totalCuts = (m-1) + (n-1);
        Console.WriteLine(totalCuts);
    }
}