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>

int main(void)
{
  int n;
  scanf("%d", &n);
  n--;
  long long int ans;
  long long int a[n];
  for(int i = 0; i != n; i++)
  {
      scanf("%lld", &a[i]);
  }
  for(int i = 0; i != n; i++)
  {
      ans = ans * a[i];
      if(ans > 1000000000000000000)
      {
        ans = -1;
        break;
      }
  }
  printf("%lld\n", ans);
  return 0;
}