#include <iostream>

using namespace std;

class VectorN {
    int n;
    double *m;
public:
    VectorN(int);
    VectorN(VectorN*);
    ~VectorN();
    void read();
    void print();
    void operator *=(double d);
    void operator+=(VectorN&);
    friend ostream& operator<<(ostream &,VectorN &);
};

VectorN::VectorN(int n) {
    this->n = n;
    this->m = new double[n];
}
void VectorN::operator *=(double d){
    for(int i=0;i<n;i++) m[i]*=d;
}

VectorN::VectorN(VectorN *v) {
    n = v->n;
    //m = v->m; // rossz!!!
    m = new double[n];
    for (int i=0;i<n;i++) m[i]=v->m[i];
}

VectorN::~VectorN() {
    delete[] m;
}

void VectorN::read() {
    for (int i=0;i<n;i++) cin >> m[i];
}

void VectorN::print() {
    cout << "(" << m[0];
    for (int i=1;i<n;i++) cout << "," << m[i];
    cout << ")";
}
void VectorN::operator+=(VectorN &v){
    if(n==v.n){
        for(int i=0;i<n;i++) m[i]+=v.m[i];
    }
}

ostream& operator<<(ostream &o,VectorN &v){
        o << "(" << v.m[0];
    for (int i=1;i<v.n;i++) o << "," << v.m[i];
    o << ")";
}
int main(int argc, char** argv) {
    VectorN v(3);
    v.read();
    v*=3;
    cout<<v;
    VectorN v2(3);
    v2.read();
    v+=v2;
    cout<<v;
    return 0;
}