// Example program
#include <iostream>
#include <string>

class VECTOR {
private:
    int v[3];
public:
    // контруктор по умочанию
    VECTOR();
    // контруктор с тремя аргументами
    VECTOR(int a, int b, int c);
    void read();
    void print();
    VECTOR mult(int s) const ;
    VECTOR operator+(const VECTOR& other);
    VECTOR operator-(const VECTOR& other);
    VECTOR& operator--();
};

VECTOR::VECTOR() {
    v[0] = v[1] = v[2] = 0;
}

VECTOR::VECTOR(int a, int b, int c) {
    v[0] = a;
    v[1] = b;
    v[2] = c;
}

void VECTOR::read() {
    std::cin >> v[0] >> v[1] >> v[2];
}

void VECTOR::print() {
    std::cout << "("
              << v[0] << ", "
              << v[1] << ", "
              << v[2] << ")" << std::endl;
}

VECTOR VECTOR::operator+(const VECTOR& other) {
    return VECTOR(v[0] + other.v[0], v[1] + other.v[1], v[2] + other.v[2]);
}

VECTOR VECTOR::operator-(const VECTOR& other) {
    return *this + other.mult(-1);
}

VECTOR& VECTOR::operator--() {
    v[0]--;
    v[1]--;
    v[2]--;

    return *this;
}

VECTOR VECTOR::mult(int s) const {
    return VECTOR(v[0] * s, v[1] * s, v[2] * s);
}

int main()
{
  VECTOR vec;
  vec.read();
  std::cout << "vec = ";
  vec.print();

  std::cout << "vec2 = vec * 2 = ";
  VECTOR vec2 = vec.mult(2);
  vec2.print();

  std::cout << "vec + vec2 = : ";
  (vec + vec2).print();
  std::cout << "vec + vec2 = : ";
  (vec - vec2).print();
  std::cout << "--vec = ";
  (--vec).print();
}