#include <iostream>
#include <cstdio>

using namespace std;

int N;
int masu[30][30];
int dir;	//右1,下2,左3,上4

int main()
{
	cin >> N;

	for (int i=0; i<N; i++)
		for (int j=0; j<N; j++)
			masu[i][j] = 0;

	int num = 1;
	dir = 1;
	int ni = 0, nj = 0;

	while (num <= N * N)
	{
		masu[ni][nj] = num;
		switch (dir)
		{
			case 1:
				nj++;
				if (nj >= N)
				{
					nj--;
					dir = 2;
					ni++;
					num++;
					break;
				}
				if (masu[ni][nj] != 0)
				{
					nj--;
					dir = 2;
					ni++;
					num++;
					break;
				}
				num++;
				break;
			case 2:
				ni++;
				if (ni >= N)
				{
					ni--;
					dir = 3;
					nj--;
					num++;
					break;
				}
				if (masu[ni][nj] != 0)
				{
					ni--;
					dir = 3;
					nj--;
					num++;
					break;
				}
				num++;
				break;
			case 3:
				nj--;
				if (nj < 0)
				{
					nj++;
					dir = 4;
					ni--;
					num++;
					break;
				}
				if (masu[ni][nj] != 0)
				{
					nj++;
					dir = 4;
					ni--;
					num++;
					break;
				}
				num++;
				break;
			case 4:
				ni--;
				if (masu[ni][nj] != 0)
				{
					ni++;
					dir = 1;
					nj++;
					num++;
					break;
				}
				num++;
				break;
		}
	}

	for (int i=0; i<N; i++)
	{
		for (int j=0; j<N; j++)
		{
			printf("%03d", masu[i][j]);
			if (j != N - 1) printf(" ");
			else if (j == N - 1) printf("\n");
		}
	}
}