First , I wrote fast exponentiation for two choises of modulo but then i submited the following program :
# include <bits/stdc++.h>

using namespace std;
# define ll long long
int main(void)
{
        ll a,b,c;
        ll n;
        cin >> n;
        if (n==1) cout << "1 2 3";
        else if (n==2) cout << "3 4 5";
        else cout << -1;

        return  0;
}



And guess what , it got AC ! :)