#include 
    using namespace std;
    void copy (int& p, int& q, int& r)
    {
        p = p * 1;
        q = q * 2;
        r = r * 3;
    }
    int main ()
    {
        int m = 6, n = 3, o = 2;
        copy (m, n, o);
        cout << "M = " << m << ", N = " << n << ", O = " << o;
        return 0;
    }