dx = (0,1,0,-1); dy = (-1,0,1,0)
N = int(raw_input())
assert 1 <= N <= 30
whirlnumber = [[""]*N for i in xrange(N)]
x,y = -1,0
number = 0
di = 1
while number < N*N:
	for j in xrange(N-di/2):
		x += dx[di%4]; y += dy[di%4]
		whirlnumber[y][x] = "%03d" % (number+1)
		number += 1
	di += 1
for l in whirlnumber:
	print " ".join(l)