#include "bits/stdc++.h"
using namespace std;

int main() {
    unsigned long N;
    int ans;
    cin >> N;
    if(N < 6 || N == 7) ans = -1;
    else {
        N -= 3;
        if((N & N-1)==0) {
            N -= 2;
            if((N & N-1)==0) ans = -1;
            else ans = 5;
        } else ans = 3;
    }
    if(ans == -1) cout << ans << '\n';
    else cout << ans << " " << N << '\n';
    return 0;
}