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 Ruby (2.7.1) (judge verdict: Runtime Error)

N = gets.to_i
A = gets.chomp.split.map(&:to_i)
ans = A[0]

(1..N-1).each do |i|
  ans *= A[i]
  break if ans > 10**18
end

if ans > 10**18
  puts -1
else
  puts ans
end