from itertools import cycle

N = int(input())

A = [[0] * N for _ in range(N)]

dij = cycle([(0, 1), (1, 0), (0, -1), (-1, 0)])

i, j = 0, 0
di, dj = next(dij)
cnt = 1
while cnt <= N * N:
    A[i][j] = cnt

    ni, nj = i + di, j + dj
    if not (0 <= ni < N and 0 <= nj < N) or A[ni][nj] != 0:
        di, dj = next(dij)
        ni, nj = i + di, j + dj

    i, j = ni, nj

    cnt += 1

for ai in A:
    for aij in ai:
        print(f"{aij:03}", end=" ")
    print()