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


namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            int[] arr = Console.ReadLine().Split(' ').Select(int.Parse).ToArray();
            int broi = 1;
            int nai_golqm_broi=0, nai_chesto_sreshtan_el=0, el_za_proverka;
            for (int i = 0; i < arr.Length-1; i++)
            {
                el_za_proverka = arr[i];
                for (int j = i+1; j < arr.Length; j++)
                {

                    if (el_za_proverka == arr[j]) broi++;
                    if (broi > nai_golqm_broi) { nai_golqm_broi = broi; nai_chesto_sreshtan_el = arr[i];}

                }
                broi = 1;
            }
            Console.WriteLine(nai_chesto_sreshtan_el);

        }
    }
}