using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace foryuki
{
    class Program
    {
        static void Main(string[] args)
        {
            int[] a = ConvertStringArrayToIntArray(Console.ReadLine().Split());
            int[] b = ConvertStringArrayToIntArray(Console.ReadLine().Split());
            int t = Math.Max(a[0], a[1]);
            if (a[0] == a[1] && b[0] == b[1] && a[0] > b[0]) t += 1;
            Console.WriteLine(t);
        }

        //-------------------------------------------------------------

        static int[] ConvertStringArrayToIntArray(string[] array)
        {
            return Array.ConvertAll(array, str => int.Parse(str));
        }

        static List<int> ConvertStringArrayToIntList(string[] str)
        {
            var list = new List<int>();
            foreach (var c in str)
            {
                list.Add(int.Parse(c));
            }
            return list;
        }
    }
}