N = int(input())
maps = [[0 for i in range(N)] for j in range(N)]

i, j = 0, 0
n = 1
direct = 0  # 0->, 1down, 2<-, 3up
direct_changed = False
while n < N*N:
    maps[i][j] = n
    direct_changed = False
    if direct == 0:
        if j < N - 1 and maps[i][j+1] == 0:
            j += 1
        else:
            direct = 1
            direct_changed = True
    elif direct == 1:
        if i < N - 1 and maps[i+1][j] == 0:
            i += 1
        else:
            direct = 2
            direct_changed = True
    elif direct == 2:
        if j > 0 and maps[i][j-1] == 0:
            j -= 1
        else:
            direct = 3
            direct_changed = True
    elif direct == 3:
        if i > 0 and maps[i-1][j] == 0:
            i -= 1
        else:
            direct = 0
            direct_changed = True
    if not direct_changed:
        n += 1
        
maps[i][j] = N*N
for i in range(N):
    for j in range(N):
        print("%03d" % maps[i][j], end=" ")
    print()