class Program
{
    static void Main(string[] args)
    {
        string[] input = Console.ReadLine()!.Split(' ');
        int left = int.Parse(input[0]);
        int right = int.Parse(input[1]);

        if (left < right)
        {
            int tmp = left;
            left = right;
            right = tmp;
        }

        int count = 0;
        while (right > 0)
        {
            left--;
            right--;
            count += 2;
        }

        if (left == right)
        {
            Console.WriteLine(count - 1);
        }
        else
        {
            Console.WriteLine(count);
        }
    }
}