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

namespace Test
{
    class Program
    {
        static void Main(string[] args)
        {
            int[] x = Console.ReadLine().Split().Select(int.Parse).ToArray();
            if (x[0] == 0 && x[1] == 0) Console.WriteLine(1);
            else
            {
                double ret = Math.Sqrt(x[0] * x[0] + x[1] * x[1]);
                ret *= 2;
                Console.WriteLine(ret % 1 == 0 ? ret + 1 : ret);
            }
        }
    }
}