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 C (GCC 9.2.1) (judge verdict: Wrong Answer)


#include <stdio.h>
#include<math.h>

int main(void)
{
	int n, i,c=-1;
	long long int a, b, result = 1;

	//input
	scanf("%d", &n);
	b = pow(10, 18);

	for (i = 0;i < n;i++) {
		scanf("%lld", &a);
		
		if (a == 0) {
			result *= a;
			printf("%lld",result);
			return 0;
		}

		if (result > b/a)
		{
			printf("%d", c);
			return 0;
		}
		
		result *= a;
	}


	
	//output
	printf("%lld", result);
	return 0;
}