N = int(input())
DR = [0, 1, 0, -1]
DC = [1, 0, -1, 0]
r, c, d = 0, 0, 0
ans = [[0] * N for i in range(N)]
for time in range(N * N):
    ans[r][c] = "{0:03d}".format(time + 1)
    nr, nc = r + DR[d], c + DC[d]
    if nr < 0 or nr >= N or nc < 0 or nc >= N or ans[nr][nc] != 0:
        d = (d + 1) % 4
    r, c = r + DR[d], c + DC[d]
for r in ans:
    print(" ".join(c for c in r))