#include <iostream>
#include <stdexcept>
#include <cmath>

using namespace std;
class Vektor3d
{
    int koordinate [3];
    mutable int broj_ispisa=0;

public:
    void Postavi(double x,double y,double z)
    {
        Vektor3d::koordinate[0]=x;
        Vektor3d::koordinate[1]=y;
        Vektor3d::koordinate[2]=z;
    }
    void Ocitaj (double &x,double &y,double &z)
    {
        x=Vektor3d::koordinate[0];
        y=Vektor3d::koordinate[1];
        z=Vektor3d::koordinate[2];
    }
    void Ispis() const
    {
        std::cout<<"{"<<koordinate[0]<<","<<koordinate[1]<<","<<koordinate[2]<<"}";
        broj_ispisa++;
    }
    double DajX() const
    {
        return koordinate[0];
    }
    double DajY() const
    {
        return koordinate[1];
    }
    double DajZ() const
    {
        return koordinate[2];
    }
    double DajDuzinu() const
    {
        return sqrt(koordinate[0]*koordinate[0]+koordinate[1]*koordinate[1]+koordinate[2]*koordinate[3]);
    }
    Vektor3d &PomnoziSkalarom(double s)
    {
        koordinate[0]*=s;
        koordinate[1]*=s;
        koordinate[2]*=s;
        return *this;
    }
    Vektor3d &SaberiSa (const Vektor3d &v)
    {
        koordinate[0]+=v.koordinate[0];
        koordinate[1]+=v.koordinate[1];
        koordinate[2]+=v.koordinate[2];
        return *this;
    }
    friend Vektor3d ZbirVektora(const Vektor3d &v1, const Vektor3d &v2);
    Vektor3d PostaviX (int x)
    {
        Vektor3d::koordinate[0]=x;
        return *this;
    }
    Vektor3d PostaviY (int y)
    {
        Vektor3d::koordinate[1]=y;
        return *this;
    }
    Vektor3d PostaviZ (int z)
    {
        Vektor3d::koordinate[2]=z;
        return *this;
    }
    int BrojIspisa () {
    return broj_ispisa;
    }
};
Vektor3d ZbirVektora (const Vektor3d &v1, const Vektor3d &v2)
{
    Vektor3d v3;
    v3.koordinate[0]=v1.koordinate[0]+v2.koordinate[0];
    v3.koordinate[1]=v1.koordinate[1]+v2.koordinate[1];
    v3.koordinate[2]=v1.koordinate[2]+v2.koordinate[2];
    return v3;
}


int main()
{
    Vektor3d v1,v2,v3;
    v1.Postavi(1,2,3);
    v2.Postavi(1,2,3);
    v2.Postavi(1,2,3);
    v1.Ispis();
    v1.SaberiSa(v2).Ispis();
    Vektor3d v4;
    v4.PostaviX(1);
    v4.PostaviY(1);
    v4.PostaviZ(1);
    int a=v1.DajX();
    int b=v2.DajY();
    int c=v1.DajZ();
    Vektor3d d=ZbirVektora(v1,v2);
    cout<<"Vektor se ispisao: "<<v4.BrojIspisa();

    return 0;
}