N = int(input())

a = [[0 for _ in range(N)] for _ in range(N) ]

b = [[x1, x2] for x1, x2 in zip(range(N), reversed(range(N)))]

yyy = sum(b, [])[:N]

xxx = sum(reversed(b), [])[:N]

xy = []
for i in range(N):
    xy.append([xxx[i], yyy[i]])
    if i == N-1:
        break
    xy.append([xxx[i], yyy[i+1]])



x = 0
y = 0
v = 1
for x_, y_ in xy:
    if x == x_:
        yy = list(range(y, y_+1)) if y <= y_ else reversed(list(range(y_, y+1)))
        for y__ in yy:
            if a[y__][x] == 0:
                a[y__][x] = v
                y = y__
                v = v+1
    elif y == y_:
        xx = list(range(x, x_+1)) if x <= x_ else reversed(list(range(x_, x+1)))
        for x__ in xx:
            if a[y][x__] == 0:
                a[y][x__] = v
                x = x__
                v = v+1

for r in a:
    z = [str(n).zfill(3) for n in r]
    print(' '.join(z))