N = int(input())
l = [[0] * N for i in range(N)]
d = 0

x = 0
y = 0

for i in range(1, N**2 + 1):
    if d % 4 == 0:
        l[x][y] = str(i).zfill(3)
        y += 1
        if y >= N or l[x][y] != 0:
            d += 1
            y -= 1
            x += 1
    elif d % 4 == 1:
        l[x][y] = str(i).zfill(3)
        x += 1
        if x >= N or l[x][y] != 0:
            d += 1
            x -= 1
            y -= 1
    elif d % 4 == 2:
        l[x][y] = str(i).zfill(3)
        y -= 1
        if y < 0 or l[x][y] != 0:
            d += 1
            y += 1
            x -= 1
    elif d % 4 == 3:
        l[x][y] = str(i).zfill(3)
        x -= 1
        if l[x][y] != 0:
            d += 1
            x += 1
            y += 1

ans = ""
for i in l:
    ans = ""
    for j in i:
        ans += j
        ans += " "
    print(ans)