Problem:
Score : 100 points

Problem Statement

Compute A \times B.

Constraints

1 \leq A \leq 100

1 \leq B \leq 100

All values in input are integers.

Input

Input is given from Standard Input in the following format:

A B

Output

Print the value A \times B as an integer.

Sample Input 1

2 5

Sample Output 1

10

We have 2 \times 5 = 10.

Sample Input 2

100 100

Sample Output 2

10000

Solution in Haskell (GHC 8.8.3) (judge verdict: Runtime Error)

toInteg :: String -> Integer
toInteg = read :: String -> Integer

main :: IO ()
main = do
    n <- getLine
    an <- map toInteg . words <$> getLine
    let resulte = product an
    if resulte > (10^18)
        then putStrLn $ "-1"
        else putStrLn $ show $ resulte