#include <iostream>
using namespace std;

class Number {
    int a, b;
    public:
    Number();
    Number(int a, int b);
    friend ostream& operator << (ostream& o, const Number &x);
    friend istream& operator >> (istream& i, Number &x);
    Number operator + (const Number &) const;
    Number operator - (const Number &) const;
    Number operator - () const;
    Number operator * (const Number &) const;
};

Number::Number() : a(0), b(0) {}
Number::Number(int a, int b) : a(a), b(b) {}
ostream& operator << (ostream &o, const Number &x) {
    return o << x.a << '+' << x.b << "√7";
}
istream& operator >> (istream &i, Number &x) {
    return i >> x.a >> x.b;
}

Number Number::operator + (const Number &x) const {
    return Number(a + x.a, b + x.b);
}
Number Number::operator - (const Number &x) const {
    return Number(a - x.a, b - x.b);
}
Number Number::operator - () const {
    return Number(-a, -b);
}
Number Number::operator * (const Number &x) const {
    return Number(a * x.a + 7 * b * x.b, a * x.b + b * x.a);
}

int main() {
    Number a, b;
    cin >> a >> b;
    cout << a + b << endl;
    cout << a - b << endl;
    cout << -a << endl;
    cout << -b << endl;
    cout << a * b << endl;
    return 0;
}
#include <iostream>
using namespace std;

class Number {
    int a, b;
    public:
    Number();
    Number(int a, int b);
    friend ostream& operator << (ostream& o, const Number &x);
    friend istream& operator >> (istream& i, Number &x);
    Number operator + (const Number &) const;
    Number operator - (const Number &) const;
    Number operator - () const;
    Number operator * (const Number &) const;
};

Number::Number() : a(0), b(0) {}
Number::Number(int a, int b) : a(a), b(b) {}
ostream& operator << (ostream &o, const Number &x) {
    return o << x.a << '+' << x.b << "√7";
}
istream& operator >> (istream &i, Number &x) {
    return i >> x.a >> x.b;
}

Number Number::operator + (const Number &x) const {
    return Number(a + x.a, b + x.b);
}
Number Number::operator - (const Number &x) const {
    return Number(a - x.a, b - x.b);
}
Number Number::operator - () const {
    return Number(-a, -b);
}
Number Number::operator * (const Number &x) const {
    return Number(a * x.a + 7 * b * x.b, a * x.b + b * x.a);
}

int main() {
    Number a, b;
    cin >> a >> b;
    cout << a + b << endl;
    cout << a - b << endl;
    cout << -a << endl;
    cout << -b << endl;
    cout << a * b << endl;
    return 0;
}