#include <iostream>
    using namespace std;
    void duplicate (int& P, int& Q, int& R)
    {
        P *= 2;
        Q *= 2;
        R *= 2;
    }
    int main ()
    {
        int M = 2, N = 4, O = 6;
        duplicate (M, N, O);
        cout << M <<" "<< N <<" "<< O;
        return 0;
    }