class Program
    {
        static void Main(string[] args)
        {
            string[] magnet = Console.ReadLine().Split(' ');
            int borderCount = 0;
            borderCount = int.Parse(magnet[0]) + int.Parse(magnet[1]);
            if (int.Parse(magnet[0]) != int.Parse(magnet[1]))
            {
                int num = int.Parse(magnet[0]) - int.Parse(magnet[1]);
                if(num < 0)
                {
                    num *= -1;
                }
                borderCount += num-1;
            }
            Console.WriteLine(borderCount);
        }
    }