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.split(" ").map(&:to_i)
i = 0
res = 1
 
while i < a.length do
  res = res * a[i]
  i += 1
end
 
if res > 10 ** 18
  puts "-1"
else
  puts res
end