#include<bits/stdc++.h>
using namespace std;
#define rep(i,a,b) for(int i=a;i<b;i++)


int N;
int ans[30][30];
//-----------------------------------------------------------------
int x, y, d;
int dx[4] = { 0, 1, 0, -1 };
int dy[4] = { -1, 0, 1, 0 };
void next() {
	int xx = x + dx[d];
	int yy = y + dy[d];

	if (xx < 0 || N <= xx)
	{
		d = (d + 1) % 4;
		xx = x + dx[d];
		yy = y + dy[d];
	}
	else if (yy < 0 || N <= yy)
	{
		d = (d + 1) % 4;
		xx = x + dx[d];
		yy = y + dy[d];
	}
	else if (ans[yy][xx] != 0)
	{
		d = (d + 1) % 4;
		xx = x + dx[d];
		yy = y + dy[d];
	}

	x = xx;
	y = yy;
}
//-----------------------------------------------------------------
int main()
{
	cin >> N;

	x = 0, y = 0, d = 1;

	int idx = 1;
	rep(i, 0, N*N) {
		ans[y][x] = idx;
		next();
		idx++;
	}

	rep(yy, 0, N) {
		rep(xx, 0, N) printf("%03d ", ans[yy][xx]);
		printf("\n");
	}
}