n = int(input('Размер: '))
a = []
for i in range(n):
    a.append([0,] * n)
left, right, top, bott = 0, n - 1, 0, n - 1
i, j, cnt, state = 0, 0, 1, 1
if n > 3:
    bar = n * n // 2 + (n - 2)
elif n == 3:
    bar = n * n // 2 + 2
else:
    bar = n + 1
while cnt <= bar:
    if state == 1:
        if i == top and j == right:
            state = 2
            a[i][j] = cnt
            cnt += 1
            top += 1
            right -= 2
            j = right + 1
            i = top
            continue
        a[i][j] = cnt
        cnt += 1
        j += 1
    elif state == 2:
        if i == bott and j == left:
            state = 3
            a[i][j] = cnt
            cnt += 1
            bott -= 1
            j = left
            i = bott
            continue
        a[i][j] = cnt
        cnt += 1
        i += 1
        j -= 1
    elif state == 3:
        if i == top and j == left:
            state = 1
            a[i][j] = cnt
            cnt += 1
            left += 1
            j = left
            i = top
            continue
        a[i][j] = cnt
        cnt += 1
        i -= 1
for i in range(len(a)):
    print(a[i])