using System;

using System.Linq;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        int[] moviesRented = [17, 3, 3, 2, 2, 2, 1, 1, 1, 1];

        var counts = new Dictionary<int, int>();

        foreach(var item in moviesRented){

            var count = moviesRented.Count(i => i == item);

            counts[item] = count;

        }

        var ordered = counts.OrderByDescending(v => v.Value);

        foreach(var item in ordered){

            Console.WriteLine($"{item.Value} occurrence of {item.Key}");

        }

    }

}