using Yorukatsu039.Questions;
using Yorukatsu039.Extensions;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;

namespace Yorukatsu039.Questions
{
    /// <summary>
    /// ABC111 C
    /// </summary>
    public class QuestionC : AtCoderQuestionBase
    {
        public override IEnumerable<object> Solve(TextReader inputStream)
        {
            var n = inputStream.ReadInt();
            var v = inputStream.ReadIntArray();
            var oddCounts = Count(0, v).OrderByDescending(p => p.Value).ToArray();
            var evenCounts = Count(1, v).OrderByDescending(p => p.Value).ToArray();

            if (oddCounts[0].Key != evenCounts[0].Key)
            {
                yield return v.Length - (oddCounts[0].Value + evenCounts[0].Value);
            }
            else if (oddCounts[1].Value > evenCounts[1].Value)
            {
                yield return v.Length - (oddCounts[1].Value + evenCounts[0].Value);
            }
            else
            {
                yield return v.Length - (oddCounts[0].Value + evenCounts[1].Value);
            }
        }

        public Dictionary<int, int> Count(int startIndex, int[] array)
        {
            var counts = new Dictionary<int, int>();
            counts[-1] = 0;
            for (int i = startIndex; i < array.Length; i += 2)
            {
                var current = array[i];
                if (counts.ContainsKey(current))
                {
                    counts[current]++;
                }
                else
                {
                    counts[current] = 1;
                }
            }
            return counts;
        }
    }
}


namespace Yorukatsu039
{
    class Program
    {
        static void Main(string[] args)
        {
            IAtCoderQuestion question = new QuestionC();    // 問題に合わせて書き換え
            var answers = question.Solve(Console.In);
            foreach (var answer in answers)
            {
                Console.WriteLine(answer);
            }
        }
    }
}

#region Base Classes

namespace Yorukatsu039.Questions
{

    public interface IAtCoderQuestion
    {
        IEnumerable<object> Solve(string input);
        IEnumerable<object> Solve(TextReader inputStream);
    }

    public abstract class AtCoderQuestionBase : IAtCoderQuestion
    {
        public IEnumerable<object> Solve(string input)
        {
            var stream = new MemoryStream(Encoding.Unicode.GetBytes(input));
            var reader = new StreamReader(stream, Encoding.Unicode);

            return Solve(reader);
        }

        public abstract IEnumerable<object> Solve(TextReader inputStream);
    }

}

#endregion

#region Extensions

namespace Yorukatsu039.Extensions
{
    internal static class TextReaderExtensions
    {
        internal static int ReadInt(this TextReader reader) => int.Parse(ReadString(reader));
        internal static long ReadLong(this TextReader reader) => long.Parse(ReadString(reader));
        internal static double ReadDouble(this TextReader reader) => double.Parse(ReadString(reader));
        internal static string ReadString(this TextReader reader) => reader.ReadLine();

        internal static int[] ReadIntArray(this TextReader reader, char separator = ' ') => ReadStringArray(reader, separator).Select(int.Parse).ToArray();
        internal static long[] ReadLongArray(this TextReader reader, char separator = ' ') => ReadStringArray(reader, separator).Select(long.Parse).ToArray();
        internal static double[] ReadDoubleArray(this TextReader reader, char separator = ' ') => ReadStringArray(reader, separator).Select(double.Parse).ToArray();
        internal static string[] ReadStringArray(this TextReader reader, char separator = ' ') => reader.ReadLine().Split(separator);
    }
}

#endregion

Measured memory_bytes: 29280