# yukicoder My Practice
# author: Leonardone @ NEETSDKASU
############################################################
def gs() gets.chomp end
def gi() gets.to_i end
def gf() gets.to_f end
def gss() gs.split end
def gis() gss.map(&:to_i) end
def gfs() gss.map(&:to_f) end
def nmapf(n,f) n.times.map{ __send__ f } end
def ngs(n) nmapf n,:gs end
def ngi(n) nmapf n,:gi end
def ngss(n) nmapf n,:gss end
def ngis(n) nmapf n,:gis end
def arr2d(h,w,v=0) h.times.map{[v] * w} end
def for2p(hr,wr,&pr) hr.each{|i|wr.each{|j| yield(i,j)}} end
def nsum(n) n * (n + 1) / 2 end
def vcount(d,r=Hash.new(0)) d.inject(r){|m,e| m[e]+=1;m} end
MV = [[0, 1], [1, 0], [0, -1], [-1, 0]]
############################################################

N = gi

a = arr2d N, N

y = 0
x = 0

m = 0
dy, dx = MV[m]

a[0][0] = 1
c = 2

while c <= N * N
    y += dy
    x += dx
    if y >= N || y < 0 || x < 0 || x >= N || a[y][x] != 0
        x -= dx
        y -= dy
        m += 1
        dy, dx = MV[m % 4]
    else
        a[y][x] = c
        c += 1
    end
end

puts a.map{|r| r.map{|v| "%03d" % [v] } * ' ' } * "\n"