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import Char
numstring =
"73167176531330624919225119674426574742355349194934" ++
"96983520312774506326239578318016984801869478851843" ++
"85861560789112949495459501737958331952853208805511" ++
"12540698747158523863050715693290963295227443043557" ++
"66896648950445244523161731856403098711121722383113" ++
"62229893423380308135336276614282806444486645238749" ++
"30358907296290491560440772390713810515859307960866" ++
"70172427121883998797908792274921901699720888093776" ++
"65727333001053367881220235421809751254540594752243" ++
"52584907711670556013604839586446706324415722155397" ++
"53697817977846174064955149290862569321978468622482" ++
"83972241375657056057490261407972968652414535100474" ++
"82166370484403199890008895243450658541227588666881" ++
"16427171479924442928230863465674813919123162824586" ++
"17866458359124566529476545682848912883142607690042" ++
"24219022671055626321111109370544217506941658960408" ++
"07198403850962455444362981230987879927244284909188" ++
"84580156166097919133875499200524063689912560717606" ++
"05886116467109405077541002256983155200055935729725" ++
"71636269561882670428252483600823257530420752963450"
max_mult cs = max_mult_inner cs 0
where
max_mult_inner s@(_:cs) old_max
| length s < 5 = old_max
| otherwise = max_mult_inner cs new_max
where
mult = product (map digitToInt (take 5 s))
new_max = if mult > old_max then mult else old_max
main = do
print $ max_mult numstring
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