#include <iostream>  
#include <vector>  
#include <string> 
#include <stack>
#define ll long long
using namespace std;
int main() {
    ll k; cin >> k;
    if (k == 1 || k == 2) {
        cout << "-1\n";
        return 0;
    }
    if (k % 2) {
        cout << k / 2 + 1 << " " << k * (k / 2 + 1) << "\n";
    }
    else {
        cout << k / 2 + 1 << " " << k / 2 * (k / 2 + 1) << "\n";
    }
}