using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;

class Program
{
    static int NN => int.Parse(ReadLine());
    static long[] NList => ReadLine().Split().Select(long.Parse).ToArray();
    static long[][] NArr(int n) => Enumerable.Repeat(0, n).Select(_ => NList).ToArray();
    static void Main()
    {
        var c = NList;
        var (a, b) = (c[0], c[1]);
        if (Math.Abs(a - b) > 1)
        {
            var d = Math.Abs(a - b) - 1;
            WriteLine(a + b + d);
        }
        else
        {
            WriteLine(a + b);
        }
    }
}