import sequtils, strutils

let
  n = parseInt stdin.readLine
var
  t = newSeq[string](n).repeat n
  yTop = 1
  xRight, yBottom = n.pred
  xLeft = 0
  direction = 0
  cnt = 1
  x, y = 0

while cnt <= n * n:
  t[y][x] = intToStr(cnt, 3)
  case direction
  of 0:
    if x < xRight:
      x.inc
    else:
      direction.inc
      y.inc
      xRight.dec
  of 1:
    if y < yBottom:
      y.inc
    else:
      direction.inc
      x.dec
      yBottom.dec
  of 2:
    if x > xLeft:
      x.dec
    else:
      direction.inc
      y.dec
      xLeft.inc
  else:
    if y > yTop:
      y.dec
    else:
      direction = 0
      x.inc
      yTop.inc
  cnt.inc
    
for seq1 in t:
  echo seq1.join " "