Problem:
Score : 200 points

Problem Statement

Given N integers A_1, ..., A_N, compute A_1 \times ... \times A_N.

However, if the result exceeds 10^{18}, print -1 instead.

Constraints

2 \leq N \leq 10^5

0 \leq A_i \leq 10^{18}

All values in input are integers.

Input

Input is given from Standard Input in the following format:

N
A_1 ... A_N

Output

Print the value A_1 \times ... \times A_N as an integer, or -1 if the value exceeds 10^{18}.

Sample Input 1

2
1000000000 1000000000

Sample Output 1

1000000000000000000

We have 1000000000 \times 1000000000 = 1000000000000000000.

Sample Input 2

3
101 9901 999999000001

Sample Output 2

-1

We have 101 \times 9901 \times 999999000001 = 1000000000000000001, which exceeds 10^{18}, so we should print -1 instead.

Sample Input 3

31
4 1 5 9 2 6 5 3 5 8 9 7 9 3 2 3 8 4 6 2 6 4 3 3 8 3 2 7 9 5 0

Sample Output 3

0

Solution in Haskell (GHC 8.8.3) (judge verdict: Wrong Answer)

{-# LANGUAGE TypeApplications #-}
import qualified Data.ByteString.Char8 as BS
import Data.Maybe
import Data.List

bsToInt :: BS.ByteString -> Int
bsToInt = fst . fromJust . BS.readInt

main :: IO ()
main = do
 n <- bsToInt <$> BS.getLine
 as <- map (read @Int . BS.unpack) . BS.words <$> BS.getLine
 print $ loop (sort as) 1
   where
     loop as n
       | n > 10 ^ 18 = -1
       | as == [] = n
       | otherwise = loop (tail as) (n * head as)