#include <bits/stdc++.h>   using namespace std;   int main() {     long long n, r, s;     cin >> n;     if (n % 2 == 1) {       if (n == 1) {         cout <<  -1 ;       } else {         r = (n * n - 1) / 2;         s = (n * n + 1) / 2;         cout << r <<     << s;       }     } else {       if (n == 2) {         cout <<  -1 ;       } else {         r = (n / 2) * (n / 2) - 1;         s = (n / 2) * (n / 2) + 1;         cout << r <<     << s;       }     }     cout << endl;   }   