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: Runtime Error)

using System;
class Program
{
	static void Main(string[] args)
	{
		// 整数の入力
		int num = int.Parse(Console.ReadLine());
		// スペース区切りの整数の入力
		string[] input = Console.ReadLine().Split(' ');
    long temp = 0;
    long answer = 1;
    int count = 0;
    while(count < num){
      temp = long.Parse(input[count]);
      answer = answer * temp;
      count++;
    }
    if(answer > 1000000000000000000 || answer < 0){
      answer = -1;
    }
		//出力
		Console.WriteLine(answer);
	}
}