N = gets.to_i

ans = Array.new(N) { Array.new(N) }
visited = Array.new(N) { Array.new(N) }
DY = [-1, 0, 1, 0]
DX = [0, 1, 0, -1]
direct = 1
y = 0
x = 0
num = 1

(1..N * N).each do |n|
  ans[y][x] = "%03d" % n
  visited[y][x] = true

  ny = y + DY[direct]
  nx = x + DX[direct]

  if ny < 0 || nx < 0 || N <= ny || N <= nx || visited[ny][nx]
    direct = (direct + 1) % 4

    ny = y + DY[direct]
    nx = x + DX[direct]
  end

  y = ny
  x = nx
end

puts ans.map { |row| row.join(' ') }