题解 | 构造数对

#include <iostream>
using namespace std;
int main() {
    int x;cin>>x;
    if(x==1) cout<<-1;
    else if(x==2) cout<<2<<" "<<2;
    else
     {
        if(x&1) cout<<x-1<<" "<<2;
        else cout<<x-2<<" "<<2;
     };  
}
// 64 位输出请用 printf("%lld")