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 1.8.0) (judge verdict: Runtime Error)


import java.util.*;


public class Main {

	public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ

		Scanner scan = new java.util.Scanner(System.in);

		int n = scan.nextInt();
		long[] a = new long[n];


		for(int i=0;i<n;i++) {

			 a[i] = scan.nextLong();
			 if(a[i]==0) {
				 System.out.println(0);
				 return;
			 }
		}

long c =1;
for(int i=0;i<n;i++) {
	if(a[i] <= 1000000000000000000L / c)
		c *= a[i];
	else {
		System.out.println(-1);
		return;
	}
}

if(c > 1000000000000000000L)
			System.out.println(-1);
else
	System.out.println(c);
	scan.close();

	}

}