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: Runtime Error)

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

int main(void)
{
  long int n,i;
  long int *a;
  scanf("%ld",&n);
  if(n<2||100000<n)
    return -1;
  
  if((a=calloc(n,sizeof(long int)))==NULL)
  {
    return -1;
  }
    
  for(i=0;i<n;i++)
  {
    scanf("%ld",&a[i]);
  }
  
  long int s=1;
  for(i=0;i<n;i++)
  {
    s=s*a[i];
  }
  if(s>(int)pow(10.0,18.0))
    printf("-1");
  else
  	printf("%ld",s);
  
  return 0;
}