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 <bits/stdc++.h> 
using namespace std;
#define endl "\n"
typedef long long int ll;
ll inline multiply(ll a[], ll n) 
{ 
    // Termination condition 
    if (n == 0) 
        return(a[n]); 
    else
        return (a[n] * multiply(a, n - 1)); 
} 
int main(){
 
 
 
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
   ll n;
  cin>>n;



  ll re=1,x;;
  for(int i=0;i<n;i++){
    cin>>x;
    re*=x;
  }
       
   
   (re<1e18)?cout<<re<<endl:cout<<-1<<endl;
  return 0;
}