Mencari Frekuensi bilangan (C#)

//UBAH AJAH VARIABELNYA AMA KALIAN OKOK!
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ratingdanfrekuensi_take_home_quis_
{
    class Program
    {
        static void Main(string[] args)
        {
            int[] bil = new int[20];
            int count1 = 0;
            int count2 = 0;
            int count3 = 0;
            int count4 = 0;
            int count5 = 0;
            string output = "";
            Console.WriteLine("Masukan 20 angka dari 1-5");
            for (int i = 0; i < bil.Length; i++)
            {
                Console.Write("Masukan angka ke-{0}:", i + 1);
                bil[i] = Convert.ToInt32(Console.ReadLine());
                if (bil[i] == 1)
                {
                    count1 = count1 + 1;
                }
                if (bil[i] == 2)
                {
                    count2 = count2 + 1;
                }
                if (bil[i] == 3)
                {
                    count3 = count3 + 1;
                }
                if (bil[i] == 4)
                {
                    count4 = count4 + 1;
                }
                if (bil[i] == 5)
                {
                    count5 = count5 + 1;
                }
                output = output + bil[i] + "  ";
            }
            Console.Clear();
            Console.WriteLine("Yang anda inputkan : \n {0} \n", output);
            Console.WriteLine("{0}{1,10} ", "rating", "frekuensi");
            Console.WriteLine("   1     {0}", count1);
            Console.WriteLine("   2     {0}", count2);
            Console.WriteLine("   3     {0}", count3);
            Console.WriteLine("   4     {0}", count4);
            Console.WriteLine("   5     {0}", count5);
            Console.ReadLine();
        }
    }
}