/**
 * Created at 7:17 on 2019/03/07
 */

import java.io.*;
import java.util.*;

public class Main {

  static FastScanner sc = new FastScanner();

  static int N;

  public static void main(String[] args) {

    int n = sc.nextInt();

    N = n / 2;

    ArrayList<Integer> A = new ArrayList(N);
    ArrayList<Integer> B = new ArrayList(N);

    for (int i=0; i<N; i++) {
      A.add(sc.nextInt());
      B.add(sc.nextInt());
    }

    ArrayList<Pair> rankingA = getRanking(A);
    ArrayList<Pair> rankingB = getRanking(B);

    int min;
    if (rankingA.get(0).val == rankingB.get(0).val) {
      min = 2 * N - Math.max(
              rankingA.get(0).frequency + rankingB.get(1).frequency,
              rankingA.get(1).frequency + rankingB.get(0).frequency);
    } else {
      min = 2 * N - (rankingA.get(0).frequency + rankingB.get(0).frequency);
    }

    System.out.println(min);

  }

  static ArrayList<Pair> getRanking(ArrayList<Integer> ls) {
    ArrayList<Pair> ranking = new ArrayList();
    ls.sort(null);
    for (int i=0; i<N; i++) {
      int val = ls.get(i);
      for (int j=i+1; j<=N; j++) {
        if (j == N || val != ls.get(j)) {
          ranking.add(new Pair(val, j-i));
          i = j - 1;
          break;
        }
      }
    }
    ranking.sort((x, y) -> y.frequency-x.frequency);
    if (ranking.size() == 1) {
      ranking.add(new Pair(-1, 0));
    }
    return ranking;
  }

  static class Pair {
    int val, frequency;
    Pair(int val, int frequency) {
      this.val = val;
      this.frequency = frequency;
    }

    @Override
    public boolean equals(Object obj) {
      if (this == obj) {
        return true;
      } else if (!(obj instanceof Pair)) {
        return false;
      } else {
        Pair pair = (Pair)obj;
        return pair.val == val && pair.frequency == pair.frequency;
      }
    }
  }

  static class FastScanner {
    private final InputStream in = System.in;
    private final byte[] buffer = new byte[1024];
    private int ptr = 0;
    private int buflen = 0;

    private boolean hasNextByte() {
      if (ptr < buflen) {
        return true;
      } else {
        ptr = 0;
        try {
          buflen = in.read(buffer);
        } catch (IOException e) {
          e.printStackTrace();
        }
        if (buflen <= 0) {
          return false;
        }
      }
      return true;
    }

    private int readByte() {
      if (hasNextByte()) return buffer[ptr++];
      else return -1;
    }

    private static boolean isPrintableChar(int c) {
      return 33 <= c && c <= 126;
    }

    private void skipUnprintable() {
      while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;
    }

    public boolean hasNext() {
      skipUnprintable();
      return hasNextByte();
    }

    public String next() {
      if (!hasNext()) throw new NoSuchElementException();
      StringBuilder sb = new StringBuilder();
      int b = readByte();
      while (isPrintableChar(b)) {
        sb.appendCodePoint(b);
        b = readByte();
      }
      return sb.toString();
    }

    public long nextLong() {
      if (!hasNext()) throw new NoSuchElementException();
      long n = 0;
      boolean minus = false;
      int b = readByte();
      if (b == '-') {
        minus = true;
        b = readByte();
      }
      if (b < '0' || '9' < b) {
        throw new NumberFormatException();
      }
      while (true) {
        if ('0' <= b && b <= '9') {
          n *= 10;
          n += b - '0';
        } else if (b == -1 || !isPrintableChar(b)) {
          return minus ? -n : n;
        } else {
          throw new NumberFormatException();
        }
        b = readByte();
      }
    }

    public int nextInt() {
      return (int) nextLong();
    }
  }

}


Measured memory_bytes: 32924