import strutils, sequtils, math

let
  N = parseInt readLine stdin
var
  a = newSeqWith(N, newSeqWith(N, 0))
  cnt, dir, cls = 0
  dirlist = [[0, 1], [1, 0], [0, -1], [-1, 0]]
  pos: tuple[r, c: int] = (0, -1)

while cnt < N ^ 2:
  var
    r = pos.r + dirlist[dir][0]
    c = pos.c + dirlist[dir][1]

  if r < 0 or N <= r or c < 0 or N <= c or a[r][c] != 0:
    dir = (dir + 1) mod 4
  else:
    cnt += 1
    a[r][c] = cnt
    pos = (r, c)


for i, ai in a:
  echo mapIt(ai, align($it, 3, '0')).join(" ")