using System;

public class Program

{

    public static void Main()

    {

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

            int maxCount = 0;

            int repeatingNumber = 0;

​

            for (int i = 0; i < sequence.Length; i++)

            {

                int currentCount = 0;

​

                for (int j = i; j < sequence.Length; j++)

                {

                    if (sequence[i] == sequence[j])

                    {

                        currentCount++;

                    }

                }

                if (currentCount > maxCount)

                {

                    repeatingNumber = sequence[i];

                    maxCount = currentCount;

                }

            }

​

            Console.WriteLine(repeatingNumber);

    }

}