using System;
using System.Collections.Generic;
using System.Text;
using System.Linq;



class Program
{
    public void Proc()
    {
        Reader.IsDebug = false;
        int len = int.Parse(Reader.ReadLine());

        string[,] map = new string[len, len];
        int posX = 0;
        int posY = 0;

        Dir d = Dir.Right;
        for(int i=0; i<len*len; i++) {
            map[posY, posX] = (i+1).ToString("000");
            int nextX = posX;
            int nextY = posY;
            if(d == Dir.Right) {
                nextX++;
            } else if(d == Dir.Left) {
                nextX--;
            } else if(d == Dir.Up) {
                nextY--;
            } else if(d==Dir.Down) {
                nextY++;
            }

            if(nextX < 0 || nextX >= len || nextY < 0 || nextY >= len || map[nextY, nextX] != null) {
                nextX = posX;
                nextY = posY;
                if(d == Dir.Right) {
                    d = Dir.Down;
                    nextY++;
                } else if(d == Dir.Left) {
                    d = Dir.Up;
                    nextY--;
                } else if(d == Dir.Up) {
                    d = Dir.Right;
                    nextX++;
                } else if(d==Dir.Down) {
                    d = Dir.Left;
                    nextX--;
                }
            }
            posX = nextX;
            posY = nextY;
        }

        for(int i=0; i<len; i++) {
            StringBuilder ans = new StringBuilder();
            for(int j=0; j<len; j++) {
                ans.Append(" " + map[i,j]);
            }
            Console.WriteLine(ans.ToString().Substring(1));
        }




    }

    private enum Dir {
        Up,
        Down,
        Left,
        Right,
    }





    public class Reader
    {
        public static bool IsDebug = true;
        private static String PlainInput = @"

4


";
        private static System.IO.StringReader Sr = null;
        public static string ReadLine()
        {
            if (IsDebug)
            {
                if (Sr == null)
                {
                    Sr = new System.IO.StringReader(PlainInput.Trim());
                }
                return Sr.ReadLine();
            }
            else
            {
                return Console.ReadLine();
            }
        }
    }
    static void Main()
    {
        Program prg = new Program();
        prg.Proc();
    }
}