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: Wrong Answer)

import java.util.*;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		long p = 1;
		long tooBig = 1000000000000000000L;

		long n = sc.nextLong();

		while (sc.hasNext()) {
			if (sc.hasNextLong()) {
				p *= sc.nextLong();
				if (p > tooBig) {
					System.out.println("-1");
					return;
				}
			}
		}

		System.out.println(p);
	}
}