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[] numbers = Console.ReadLine()
                .Split(' ')
                .Select(int.Parse)
                .ToArray();

            int[] values = new int[numbers.Length];
            //int[] amount = new int[numbers.Length];
            //int valueIndexToPush = 0;
            //for (int i = 0; i < numbers.Length; i++)
            //{
            //    int index = Array.IndexOf(values, numbers[i]);
            //    if (index > -1)
            //    {
            //        amount[index]++;
            //    }
            //    else
            //    {
            //        values[valueIndexToPush] = numbers[i];
            //        amount[valueIndexToPush] = 1;
            //        valueIndexToPush++;
            //    }
            //}

            //int max = amount.Max();
            //int indexOfMax = Array.IndexOf(amount, max);

            //Console.WriteLine(values[indexOfMax]);
            List<int> numbersSeen = new List<int>();
            for (int i = 0; i < numbers.Length; i++)
            {
                if (numbersSeen.Contains(numbers[i]))
                {
                    values[Array.IndexOf(numbers, numbers[i])]++;
                }
                else
                {
                    values[Array.IndexOf(numbers, numbers[i])]++;
                    numbersSeen.Add(numbers[i]);
                }
            }
            int max = numbers[Array.IndexOf(values,values.Max())];
            //int maxIndex = numbers[Array.IndexOf(numbers, values.Max())];
            Console.WriteLine(max);
        }
    }
}