using static System.Math;
using System;

public class Hello
{
    static void Main()
    {
        string[] line = Console.ReadLine().Trim().Split(' ');
        var a = long.Parse(line[0]);
        var b = long.Parse(line[1]);
        getAns(a, b);
    }
    static void getAns(long a, long b)
    {
        if (a == 0 && b == 0) Console.WriteLine(0);
        else Console.WriteLine(2L * Max(a, b) - 1);
    }
}