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 Java (OpenJDK 11.0.6) (judge verdict: Runtime Error)

import java.util.Scanner;

class Main {    
    public static void main(String[] args) { 
        Scanner in = new Scanner(System.in);
      	int n = in.nextInt();
        long ans = 1;
        while(n-- >0) {
            long ele = in.nextLong();
            ans = ans*ele;
            if(ans > 1000000000000000000L) {
                ans = -1; 
            }    
        }
        System.out.println(ans<0?-1:ans);
    }
}