using System;
using System.Collections.Generic;
using System.Net.Mime;

namespace app
{
    public struct NumberCount
    {
        public int EvenCount;

        public int OddCount;


    }


    class Program
    {
        static void Main(string[] args)
        {
          //  var count = Convert.ToInt32(Console.ReadLine());
            int[] arr = new []{1, 3, 1, 3};

            Dictionary<int, int> uniqueNumbs = GetUniqueNumbs(arr);
        }

        static NumberCount GetCountOfEvenNumb(int[] arr)
        {
            var evenCount = 0;

            var oddCount = 0;

            foreach (var a in arr)
            {
                if (a % 2 == 0)
                {
                    ++evenCount;
                }

                else
                {
                    ++oddCount;
                }
            }

            return new NumberCount
            {
                EvenCount = evenCount,
                OddCount = oddCount
            };
        }

        static Dictionary<int, int> GetUniqueNumbs(int[] arr)
        {
            Dictionary<int, int> uniqueNumbs = new Dictionary<int, int>();


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

                if (!uniqueNumbs.ContainsKey(arr[i]))
                {
                    uniqueNumbs.Add(arr[i], 1);
                }

                else
                {
                    ++ uniqueNumbs[arr[i]];
                }
            }

            return uniqueNumbs;
        }
    }
}