n = int(input())
a = [[None for j in range(n)] for i in range(n)]
x = 0
y = 0
dx = 0
dy = 1
for i in range(n**2):
    a[x][y] = '%03d' % (i + 1)
    if i == n**2 - 1:
        break
    while x + dx < 0 or n <= x + dx or y + dy < 0 or n <= y + dy or a[x + dx][y + dy]:
        dx, dy = -dy, dx
    x += dx
    y += dy
for i in range(n):
    print(*a[i])