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 C# (.NET Core 3.1.201) (judge verdict: Accepted)

using System;
using System.Collections;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Numerics;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using static System.Math;

public static class P
{
    public static void Main()
    {
        try
        {
            checked
            {
                var a = Console.ReadLine().Split().Select(long.Parse).ToArray();
                var res = a.Contains(0) ? 0 : a.Aggregate(1L, (x, y) => x * y);
                if (res > 1000000000000000000) throw new Exception();
                Console.WriteLine(res);
            }
        }
        catch
        {
            Console.WriteLine(-1);
        }
    }
}