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

namespace MostFrequentNumber
{
    class Program
    {
        static void Main(string[] args)
        {
            int[] input =
            Console.ReadLine().Split().Select(int.Parse).ToArray();
            Dictionary<int, int> occurrences = new Dictionary<int, int>();

            for (int i = 0; i < input.Length; i++)
            {
                if (!occurrences.ContainsKey(input[i]))
                {
                    occurrences[input[i]] = 1;
                }
                else
                {
                    occurrences[input[i]]++;
                }
            }
            var sorted = occurrences.OrderByDescending(x => x.Value).ToArray();
            foreach (var o in sorted)
            {
                Console.WriteLine(o.Key);
                break;
            }
        }
    }
}