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


namespace Revision
{
    class ContinueTest
    {
        static void Main()
        {
            string input = Console.ReadLine();
            string[] inputSplit = input.Split(' ');

            int[] numbers = new int[inputSplit.Length];
            for (int i = 0; i < numbers.Length; i++)
            {
                numbers[i] = int.Parse(inputSplit[i]);
            }

            int count = 1;
            int frequent = 0;
            int highestCount = 0;
            int mostFrequent = 0;
            for (int k = 0; k < numbers.Length; k++)
            {
                for (int l = k + 1; l < numbers.Length; l++)
                {
                    if (numbers[k] == numbers[l])
                    {
                        count++;
                        frequent = numbers[k];
                        if (count > highestCount)
                        {
                            highestCount = count;
                            mostFrequent = frequent;
                        }
                    }
                    else
                    {
                        count = 1;
                    }
                }
                count = 1;
            }
            if (mostFrequent == 0)
            {
                Console.WriteLine("{0}", numbers[0]);
            }
            else
            {
                Console.WriteLine(mostFrequent);
            }
        }
    }
}