using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;

class Program
{
    static int NN => int.Parse(ReadLine());
    static int[] NList => ReadLine().Split().Select(int.Parse).ToArray();
    static int[][] NArr(long n) => Enumerable.Repeat(0, (int)n).Select(_ => NList).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var c = NList;
        var (n, m) = (c[0], c[1]);
        var map = NArr(n);
        var ans = int.MaxValue;
        var bitmax = 1 << n;
        for (var b = 0; b < bitmax; ++b)
        {
            for (var s = 0; s < 4; ++s)
            {
                var h = new int[n][];
                for (var i = 0; i < n; ++i) h[i] = (int[]) map[i].Clone();
                var sub = 0;
                var lines = 0;
                for (var j = 0; j < n; ++j)
                {
                    if (((b >> j) & 1) != 0)
                    {
                        for (var i = 0; i < n; ++i)
                        {
                            sub += h[i][j];
                            h[i][j] = 0;
                        }
                        ++lines;
                    }
                }
                if (s % 2 == 1)
                {
                    for (var i = 0; i < n; ++i) if (((b >> i) & 1) == 0)
                    {
                        sub += h[i][i];
                        h[i][i] = 0;
                    }
                    ++lines;
                }
                if (s / 2 == 1)
                {
                    for (var i = 0; i < n; ++i) if (((b >> i) & 1) == 0)
                    {
                        sub += h[n - i - 1][i];
                        h[n - i - 1][i] = 0;
                    }
                    ++lines;
                }
                var hsum = new List<int>(n);
                for (var i = 0; i < n; ++i)
                {
                    var sum = 0;
                    for (var j = 0; j < n; ++j) sum += h[i][j];
                    hsum.Add(sum);
                }
                hsum.Sort();
                // WriteLine($"b={b}, s={s}, lines={lines}, hsum={string.Join(" ", hsum)}, sub={sub}, ans={sub + hsum.Take(Math.Min(n, Math.Max(0, m - lines))).Sum()}");
                if (m - lines <= n) ans = Math.Min(ans, sub + hsum.Take(Math.Max(0, m - lines)).Sum());
            }
        }
        WriteLine(ans);
    }
}