using System.CodeDom.Compiler;

using System.Collections.Generic;

using System.Collections;

using System.ComponentModel;

using System.Diagnostics.CodeAnalysis;

using System.Globalization;

using System.IO;

using System.Linq;

using System.Reflection;

using System.Runtime.Serialization;

using System.Text.RegularExpressions;

using System.Text;

using System;

​

public class Program

{

    public static int EqualizeArray(List<int> arr)

    {

        var dict = new Dictionary<int, int>(); //Uses a dictionary to count all the occurances of an element in arr

        //Populates the dictionary by counting each occurance of an element

        foreach(var num in new HashSet<int>(arr))

            dict.Add(num, arr.Count(x => x == num));

        //To get the least number of removals, we must look for the element which appears the most, then we delete the rest

        var maxKey = dict.MaxBy(entry => entry.Value).Key;

        //Return arr.Count() - dict[maxKey];

        return arr.Count - dict[maxKey];

    }

    public static void Main()

    {

        List<int> arr = new List<int> {3, 3, 2, 1, 3};

        Console.WriteLine(EqualizeArray(arr));

    }

}