#include <iostream>
#include <vector>
#include <algorithm>
#include <string>

template <typename T, std::size_t X>
class Wektor{

    T z[X];

public:
    Wektor(){
    for(int i = 0; i < X; i++){
        z[i] = 0; }
    }

    typedef T value_type;
    T& operator[](std::size_t y) {
        return z[y];
    }

};

template <typename w, typename q>

typename w::value_type operator*(w x, q y){
    typename w::value_type sum =0;
    for (int i = 0; i < 3 ;i++){
        sum = sum + x[i]*y[i];
    }
    return sum;
}

int main() {
    Wektor<int, 3> wek;
    for ( int i = 0; i < 3; i++){
    std::cout << wek[i] << "\n";
    }
    Wektor<int,3> wek2;
    std::cout <<"\n" << wek*wek2;


    return 0;
}