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

class Magatro {
   static long N = long.Parse(Console.ReadLine());
    static void Main() {
        int[,] masu = new int[N, N];
        //左=0
        int muki = 0;
        int x = 0, y = 0;
        for(int i = 0; i < N * N; i++) {
            masu[x, y] = i + 1;
            switch (muki) {
                case 0:
                    if (x + 1 < N ) {
                        if (masu[x + 1, y] == 0) {
                            x++;
                            break;
                        }
                     
                    }
                    muki++;
                    y++;
                    
                    break;
                case 1:
                    if (y + 1 < N ) {
                        if (masu[x, y + 1] == 0) {
                            y++;
                            break;
                        }
                    }
                    muki++;
                    x--;
                    break;
                case 2:
                    if (x - 1 >= 0 ) {
                        if (masu[x - 1, y] == 0) {
                            x--;
                            break;
                        }
                    }
                    muki++;
                    y--;
                    break;
                case 3:
                    if (y - 1 >= 0) {
                        if (masu[x , y-1] == 0) {
                            y--;
                            break;
                        }
                    }
                    muki=0;
                    x++;
                    break;
            }
        }
        for(int i = 0; i < N; i++) {
            string s = "";
            for(int j = 0; j < N; j++) {                
                if (j == N - 1) {
                    s+= string.Format("{0:D3}", masu[j, i]);
                }
                else {
                    s += string.Format("{0:D3}", masu[j, i])+" ";
                }
            }
            Console.WriteLine(s);
        }
    }

}