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.chomp.to_i
a = gets.chomp.split(" ").map!{|item| item.to_i}
num = 1
ans = 1
a.sort{|a,b| (-1)*(a <=> b)}
for num in 1..n do
    if a[n -1 ] == 0
        ans = 0
    end
    ans = ans * a[num-1]
    num +=1
    if ans > 10**18
        ans = -1
        break
    end
end

puts ans