n=gets.to_i
x=n.times.map{[0]*n}
y=[]
(n-1).times{|i|
	y<<n-i-1
	y<<n-i-1
}
p1=0
xp=-1
yp=0
y.unshift(n)
dxs=[1,0,-1,0]
dys=[0,1,0,-1]
no=1
y.each{|e|
	xp=xp+dxs[p1]
	yp=yp+dys[p1]
	x[yp][xp]=no
	no+=1
	(e-1).times{|i|
		xp=xp+dxs[p1]
		yp=yp+dys[p1]
		x[yp][xp]=no
		no+=1
	}
	p1=(p1+1)%4
}
x.each{|e|
	e.size.times{|i|
		print " " if i!=0
		printf("%03d",e[i])
	}
	puts ""
}