Most Frequent Number

using System;
using System.Linq;


namespace MostFrequentNumber
{
    class MainClass
    {
        public static void Main(string[] args)
        {
            int[] arr = Console.ReadLine()
                              .Split(' ')
                              .Select(int.Parse).ToArray();

            int[] counters = new int[arr.Length];
            int  countMax  = 0;
            int  numMax    = 0;

            for (int i = 0; i < arr.Length; i++)
            {
                for (int j = i; j < arr.Length; j++)
                {
                    if ( arr[i] == arr[j] )
                    {
                        counters[i]++;

                        if (counters[i] > countMax)
                        {
                            countMax = counters[i];
                            numMax = arr[i];
                        }
                    }
                }
            }
            Console.WriteLine(numMax);
        }
    }
}