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>
long long a[100010];
int main(){
	int n;
	scanf("%d",&n);
	for(int i=0;i<n;i++)scanf("%lld",a+i);

	int zero=0;
	for(int i=0;i<n;i++)if(a[i]==0)zero++;
	if(zero>0){
		puts("0");
		return 0;
	}
	
	long long prod=1;
	for(int i=0;i<n;i++){
		if(a[i]<=1e18/prod){
			prod*=a[i];
		}else{
			puts("-1");
			return 0;
		}
	}
	printf("%lld",prod);
}