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<stdlib.h>
int main(void){
int N;
unsigned long long m=1,A[N+1];
scanf("%d",&N);
  for(int i=0;i<N;i++){
  scanf("%ld",&A[i]);
  m=m*A[i];
  }
if(m>1000000000000000000) printf("-1");
else printf("%ld",m);
return 0;
}