N = int(input())
s = [['' for j in range(N)]for i in range(N)]
used = [[False for j in range(N)] for i in range(N)]
dy = [0,1,0,-1]
dx = [1,0,-1,0]
q = [[0,0]]
it,k = 0,1
while len(q) > 0:
	p = q.pop(0)
	used[p[0]][p[1]] = True
	s[p[0]][p[1]] = '%03d' % k
	k += 1
	ny = p[0] + dy[it]
	nx = p[1] + dx[it]
	if ny < 0 or ny >= N or nx < 0 or nx >= N or used[ny][nx]:
		it = (it + 1) % 4
		ny = p[0] + dy[it]
		nx = p[1] + dx[it]
	if ny < 0 or ny >= N or nx < 0 or nx >= N or used[ny][nx]:
		break
	if not used[ny][nx]:
			q.append([ny,nx])
for i in range(N):
	print(' '.join(s[i]))