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;

int main() {
    ios::sync_with_stdio(false);

    int n;
    cin >> n;
    unsigned long long a[n], r = 1;

    for(int i = 0; i < n; i++)
        cin >> a[i];
    sort(a, a+n);

    for(int i = 0; i < n; i++) {
        if(r*a[i] > 1e18 || r*a[i] > 1000000000000000000) {
            cout << -1;
            return 0;
        }
        else
            r *= a[i];
    }
    cout << r;

    return 0;
}