using System;
using System.Collections.Generic;
using System.Linq;

namespace _2._Sequence
{
    class Program
    {
        static void Main(string[] args)
        {
            var input = Console.ReadLine()
                .Split(' ')
                .Select(int.Parse)
                .ToArray();

            var queue = new Queue<long>();
            queue.Enqueue(input[0]);

            long firstVar = input[0];
            long secondVar = 0;
            long thirdVar = 0;
            long fourthVar = 0;

            while (firstVar != input[1] && secondVar != input[1] && thirdVar != input[1] && fourthVar != input[1])
            {
                firstVar = queue.Dequeue();
                secondVar = firstVar + 1;
                queue.Enqueue(secondVar);
                thirdVar = 2 * firstVar + 1;
                queue.Enqueue(thirdVar);
                fourthVar = firstVar + 2;
                queue.Enqueue(fourthVar);
            }
            Console.WriteLine(input[1]);
        }
    }
}