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.*;

public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);

    int n = sc.nextInt();
    long[] a = new long[n];
    long ans = 1;

    for(int i = 0; i < n; i++){
      a[i] = sc.nextLong();
      ans *= a[i];
        if(ans > Math.pow(10, 18)){
          ans = -1;
          break;
        }
    }

    System.out.println(ans);
  }
}