n = int(input())

answers = [[0 for i in range(n)] for j in range(n)]


def loop(value, index, size):
    global answers

    for i in range(index, index + size):
        answers[index][i] = value
        value += 1

    for j in range(index + 1,  index + size):
        answers[j][index + size - 1] = value
        value += 1

    for i in range(index + size - 2,  index - 1, -1):
        answers[index + size - 1][i] = value
        value += 1

    for j in range(index + size - 2,  index, -1):
        answers[j][index] = value
        value += 1
    return value


size = n
value = 1
index = 0

while size >= 1:
    value = loop(value, index, size)
    index += 1
    size -= 2

for answer in answers:
    answerStringList = list(map(lambda x: str(x).zfill(3), answer))
    print(" ".join(answerStringList))