using System;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        /*

        int[][] arr = 

        {

            new int[] {1, 2, 3, 4}, // 0

            new int[] {5, 6, 7, 8} // 1

                      //0 1  2  3

        };

        Console.WriteLine(arr[1][2]);

        */

        ushort[][] arr = new ushort[2][];

        arr[0] = Console.ReadLine().Split(' ').Select(ushort.Parse).ToArray();

        arr[1] = new ushort[arr[0].Length];

        foreach(int item in arr[0])

        {

            for (int i = 0; i < arr[0].Length; i++)

            {

                if (item == arr[0][i])

                {

                    arr[1][i]++;

                }

            }

        }

        Console.WriteLine(arr[0][Array.IndexOf(arr[1], arr[1].Max())]);

    }

}