#!/bin/python
number = "73167176531330624919225119674426574742355349194934"
number = number+"96983520312774506326239578318016984801869478851843"
number = number+"85861560789112949495459501737958331952853208805511"
number = number+"12540698747158523863050715693290963295227443043557"
number = number+"66896648950445244523161731856403098711121722383113"
number = number+"62229893423380308135336276614282806444486645238749"
number = number+"30358907296290491560440772390713810515859307960866"
number = number+"70172427121883998797908792274921901699720888093776"
number = number+"65727333001053367881220235421809751254540594752243"
number = number+"52584907711670556013604839586446706324415722155397"
number = number+"53697817977846174064955149290862569321978468622482"
number = number+"83972241375657056057490261407972968652414535100474"
number = number+"82166370484403199890008895243450658541227588666881"
number = number+"16427171479924442928230863465674813919123162824586"
number = number+"17866458359124566529476545682848912883142607690042"
number = number+"24219022671055626321111109370544217506941658960408"
number = number+"07198403850962455444362981230987879927244284909188"
number = number+"84580156166097919133875499200524063689912560717606"
number = number+"05886116467109405077541002256983155200055935729725"
number = number+"71636269561882670428252483600823257530420752963450"
maxi = 0
for i in range(len(number)-13):
	count = 1
	for j in range(i, i+13):
		count = count*int(number[j])
	maxi = max(count, maxi)

print "%d" % maxi
#!/bin/python
number = "73167176531330624919225119674426574742355349194934"
number = number+"96983520312774506326239578318016984801869478851843"
number = number+"85861560789112949495459501737958331952853208805511"
number = number+"12540698747158523863050715693290963295227443043557"
number = number+"66896648950445244523161731856403098711121722383113"
number = number+"62229893423380308135336276614282806444486645238749"
number = number+"30358907296290491560440772390713810515859307960866"
number = number+"70172427121883998797908792274921901699720888093776"
number = number+"65727333001053367881220235421809751254540594752243"
number = number+"52584907711670556013604839586446706324415722155397"
number = number+"53697817977846174064955149290862569321978468622482"
number = number+"83972241375657056057490261407972968652414535100474"
number = number+"82166370484403199890008895243450658541227588666881"
number = number+"16427171479924442928230863465674813919123162824586"
number = number+"17866458359124566529476545682848912883142607690042"
number = number+"24219022671055626321111109370544217506941658960408"
number = number+"07198403850962455444362981230987879927244284909188"
number = number+"84580156166097919133875499200524063689912560717606"
number = number+"05886116467109405077541002256983155200055935729725"
number = number+"71636269561882670428252483600823257530420752963450"
maxi = 0
for i in range(len(number)-13):
	count = 1
	for j in range(i, i+13):
		count = count*int(number[j])
	maxi = max(count, maxi)

print "%d" % maxi
#!/bin/python