"""Returns the sum of all the multiples of 3 or 5 below n.

with open(os.path.dirname(__file__) + "/grid.txt") as f:

l = [] # noqa: E741

for i in range(20):

l.append([int(x) for x in f.readline().split()])

maximum = 0

# right

for i in range(20):

for j in range(17):

temp = l[i][j] * l[i][j + 1] * l[i][j + 2] * l[i][j + 3]

if temp > maximum:

maximum = temp

# down

for i in range(17):

for j in range(20):

temp = l[i][j] * l[i + 1][j] * l[i + 2][j] * l[i + 3][j]

if temp > maximum:

maximum = temp

# diagonal 1

for i in range(17):

for j in range(17):

temp = l[i][j] * l[i + 1][j + 1] * l[i + 2][j + 2] * l[i + 3][j + 3]

if temp > maximum:

maximum = temp

# diagonal 2

for i in range(17):

for j in range(3, 20):

temp = l[i][j] * l[i + 1][j - 1] * l[i + 2][j - 2] * l[i + 3][j - 3]

if temp > maximum:

maximum = temp