N = int(input())

dx, dy = 1, 0
x, y = 0, 0
ans = [[None] * N for _ in range(N)]
ans[y][x] = 1
for n in range(2, N*N+1):
    if (x < 0 or N <= x + dx
     or y < 0 or N <= y + dy
     or ans[y + dy][x + dx] != None):
        dx, dy = -dy, dx
    x += dx
    y += dy
    ans[y][x] = n

for a in ans:
    print(*['{:03d}'.format(n) for n in a])