#!/usr/bin/python
import operator
import re
#Remove leading zeros: 
#rmLeadZero=re.compile(r'0(?P<actual_num>[0-9])')
#print rmLeadZero.sub(r'\1', matrix)

def product(l):
	return int(reduce(operator.mul, l))
matrix=[[8, 2, 22, 97, 38, 15, 0, 40, 0, 75, 4, 5, 7, 78, 52, 12, 50, 77, 91, 8],
		[49, 49, 99, 40, 17, 81, 18, 57, 60, 87, 17, 40, 98, 43, 69, 48, 4, 56, 62, 0],
        [81, 49, 31, 73, 55, 79, 14, 29, 93, 71, 40, 67, 53, 88, 30, 3, 49, 13, 36, 65],
        [52, 70, 95, 23, 4, 60, 11, 42, 69, 24, 68, 56, 1, 32, 56, 71, 37, 2, 36, 91],
		[22, 31, 16, 71, 51, 67, 63, 89, 41, 92, 36, 54, 22, 40, 40, 28, 66, 33, 13, 80],
		[24, 47, 32, 60, 99, 3, 45, 2, 44, 75, 33, 53, 78, 36, 84, 20, 35, 17, 12, 50],
		[32, 98, 81, 28, 64, 23, 67, 10, 26, 38, 40, 67, 59, 54, 70, 66, 18, 38, 64, 70],
		[67, 26, 20, 68, 2, 62, 12, 20, 95, 63, 94, 39, 63, 8, 40, 91, 66, 49, 94, 21],
		[24, 55, 58, 5, 66, 73, 99, 26, 97, 17, 78, 78, 96, 83, 14, 88, 34, 89, 63, 72],
		[21, 36, 23, 9, 75, 0, 76, 44, 20, 45, 35, 14, 0, 61, 33, 97, 34, 31, 33, 95],
		[78, 17, 53, 28, 22, 75, 31, 67, 15, 94, 3, 80, 4, 62, 16, 14, 9, 53, 56, 92],
		[16, 39, 5, 42, 96, 35, 31, 47, 55, 58, 88, 24, 0, 17, 54, 24, 36, 29, 85, 57],
		[86, 56, 0, 48, 35, 71, 89, 7, 5, 44, 44, 37, 44, 60, 21, 58, 51, 54, 17, 58],
		[19, 80, 81, 68, 5, 94, 47, 69, 28, 73, 92, 13, 86, 52, 17, 77, 4, 89, 55, 40],
		[4, 52, 8, 83, 97, 35, 99, 16, 7, 97, 57, 32, 16, 26, 26, 79, 33, 27, 98, 66],
		[88, 36, 68, 87, 57, 62, 20, 72, 3, 46, 33, 67, 46, 55, 12, 32, 63, 93, 53, 69],
		[4, 42, 16, 73, 38, 25, 39, 11, 24, 94, 72, 18, 8, 46, 29, 32, 40, 62, 76, 36],
		[20, 69, 36, 41, 72, 30, 23, 88, 34, 62, 99, 69, 82, 67, 59, 85, 74, 4, 36, 16],
		[20, 73, 35, 29, 78, 31, 90, 1, 74, 31, 49, 71, 48, 86, 81, 16, 23, 57, 5, 54],
		[1, 70, 54, 71, 83, 51, 54, 69, 16, 92, 33, 48, 61, 43, 52, 1, 89, 19, 67, 48]]
largest = 0
#Horizontal
for row in range(0,20):
	for i in range(0,17):
		f_p = product(matrix[row][i:i+4])
		#print matrix[row][i:i+4]
		if f_p > largest: largest = f_p
print largest		

#Vertical
for col in range(0,20):
	for offset in range(0,17):
		current4 = []
		for i in range(0,4):
			current4.append(matrix[i+offset][col]) 
		#print current4
		f_p = product(current4)
		if f_p > largest: largest = f_p

#Dignal, left to right
#first item is first item of the 4 row
for row in range(0,17):
	for first_item in range(0,17):
		current4 = []
		for diag in range(0,4):
			current4.append(matrix[row+diag][first_item+diag])
		#print current4
		f_p = product(current4)
        if f_p > largest: largest = f_p

#Diagnol, Right to left
for row in range(3,20)[::-1]:
	for first_item in range(0,17):
		current4 = []
		for diag in range(0,4):	
			current4.append(matrix[row-diag][first_item+diag])
		#print current4
		f_p = product(current4)
		print type(f_p),type(largest),f_p,largest
        if f_p > largest: 
			print 'foo'
			largest = f_p
print largest