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


class Program
{
    static void Main()
    {
        int[] numbers = Console.ReadLine()
            .Split(" ", StringSplitOptions.RemoveEmptyEntries)
            .Select(int.Parse)
            .ToArray();

        int occurence = 1;
        int biggestOccurence = 0;
        int mostCommonNumber = 0;

        for (int i = 0; i < numbers.Length; i++)
        {
            int previous = numbers[i];
            for (int j = i + 1; j < numbers.Length - 1; j++)
            {
                int current = numbers[j];
                if (previous == current)
                {
                    occurence++;
                    if (occurence > biggestOccurence)
                    {
                        biggestOccurence = occurence;
                        mostCommonNumber = current;
                    }
                }
                else
                {
                    occurence = 1;
                }
            }

        }
        Console.WriteLine(mostCommonNumber);
    }
}