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.*;
import java.lang.Math;

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

  		int num = sc.nextInt(); 
      	long ans = 1;
      	boolean con = true;
      
      	for(int i = 0;i < num; i++) {
          ans *= sc.nextLong();
        }
      
      	if(Math.log(ans) >= 18) con = false;
      	
      	if(con) System.out.println(ans);
      	else System.out.println(-1);
        
	}
}