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

namespace YukiCoder
{
    class Program
    {
        static void Main(string[] args)
        {
            int N = int.Parse(Console.ReadLine());
            int[,] pa = new int[N, N];
            int x = 0;
            int y = 0;
            int n = 1;
            pa[0, 0] = n++;
            while (n < N * N +1)
            {
                while (x + 1 < N && pa[y, x + 1] == 0)    pa[y, ++x] = n++;
                while (y + 1 < N && pa[y + 1, x] == 0)    pa[++y, x] = n++;
                while (x - 1 >=0 && pa[y, x - 1] == 0)    pa[y, --x] = n++;
                while (pa[y - 1, x] == 0)                 pa[--y, x] = n++;
            }
            for (int i = 0; i < N; i++)
            {
                for (int j = 0; j < N; j++)  Console.Write(pa[i, j].ToString("D3") + " ");
                Console.WriteLine();
            }
            //Console.WriteLine();
            Console.ReadLine();
        }
    }
}