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.math.BigDecimal;
import java.util.Scanner;

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

		int N = in.nextInt();
		BigDecimal A[] = new BigDecimal[N];
		BigDecimal seki = new BigDecimal(1);

		for(int i = 0;i<=N-1;i++) {
			A[i] = in.nextBigDecimal();
			}
		
		for(int i = 0;i<=N-1;i++) {
			seki = seki.multiply(A[i]);
			int keta = seki.precision();
			if(keta > 18) {
				seki = new BigDecimal(-1);
				i = N;
			}
		}
		
		System.out.println(seki);
	}
}