using System;
using System.IO;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Collections.Generic;
using System.Diagnostics;
using System.Numerics;
using Enu = System.Linq.Enumerable;

public class Program
{
    public void Solve()
    {
        int size = Reader.Int(), N = Reader.Int();
        var table = Reader.Range(N, () => Reader.IntTable(size));
        int K = size * 2 + 2;
        var set = new int[N][][];
        var has = new List<int>[N * size * size + 1];
        var count = new int[N * K];
        for (int i = 0; i < has.Length; i++) has[i] = new List<int>();

        for (int who = 0; who < N; who++)
        {
            int offset = K * who;
            var grid = table[who];
            set[who] = new int[K][];
            for (int i = 0; i < K; i++) set[who][i] = new int[size];
            Action<int, int, int> Add = (type, i, num) =>
            {
                set[who][type][i] = num;
                has[num].Add(offset + type);
            };
            for (int a = 0; a < size; a++)
            {
                for (int b = 0; b < size; b++)
                {
                    Add(a, b, grid[a][b]);
                    Add(size + a, b, grid[b][a]);
                }
                Add(K - 2, a, grid[a][a]);
                Add(K - 1, a, grid[a][size - 1 - a]);
            }
        }
        int ans = size * 2 - 1;
        var seen = new int[size * N * 4];
        for (int who = 0; who < N; who++)
            foreach (var s in set[who])
            {
                int ni = 0;
                foreach (int num in s)
                    foreach (int other in has[num])
                        if (other / K != who)
                        {
                            seen[ni++] = other;
                            ans = Math.Min(ans, size * 2 - 1 - ++count[other]);
                        }
                for (int i = 0; i < ni; i++) count[seen[i]] = 0;
            }

        Console.WriteLine(ans);
    }
}


class Entry { static void Main() { new Program().Solve(); } }
class Reader
{
    static TextReader reader = Console.In;
    static readonly char[] separator = { ' ' };
    static readonly StringSplitOptions op = StringSplitOptions.RemoveEmptyEntries;
    static string[] A = new string[0];
    static int i;
    static void Init() { A = new string[0]; }
    public static void Set(TextReader r) { reader = r; Init(); }
    public static void Set(string file) { reader = new StreamReader(file); Init(); }
    public static bool HasNext() { return CheckNext(); }
    public static string String() { return Next(); }
    public static int Int() { return int.Parse(Next()); }
    public static long Long() { return long.Parse(Next()); }
    public static double Double() { return double.Parse(Next()); }
    public static int[] IntLine() { return Array.ConvertAll(Split(Line()), int.Parse); }
    public static int[] IntArray(int N) { return Range(N, Int); }
    public static int[][] IntTable(int H) { return Range(H, IntLine); }
    public static string[] StringArray(int N) { return Range(N, Next); }
    public static string[][] StringTable(int N) { return Range(N, () => Split(Line())); }
    public static string Line() { return reader.ReadLine().Trim(); }
    public static T[] Range<T>(int N, Func<T> f) { var r = new T[N]; for (int i = 0; i < N; r[i++] = f()) ; return r; }
    static string[] Split(string s) { return s.Split(separator, op); }
    static string Next() { CheckNext(); return A[i++]; }
    static bool CheckNext()
    {
        if (i < A.Length) return true;
        string line = reader.ReadLine();
        if (line == null) return false;
        if (line == "") return CheckNext();
        A = Split(line);
        i = 0;
        return true;
    }
}