#include <iostream>

using namespace std;

class Rational {
public:
    Rational() : numerator_(0), denominator_(1) {}

    explicit Rational(int value) : numerator_(value), denominator_(1) {}

    Rational(int numerator, int denominator) : numerator_(numerator), denominator_(denominator) {
        Reduction();
    }

    int Numerator() const {
        return numerator_;
    }

    int Denominator() const {
        return denominator_;
    }


    void Addition(const Rational& right) {
        numerator_ = numerator_ * right.denominator_ + right.numerator_ * denominator_;
        denominator_ *= right.denominator_;
        Reduction();
    }

    /* Аналогично:
    Subtraction
    Division
    Multiplication */

private:
    void Reduction() {
        if (denominator_ < 0) {
            numerator_ = -numerator_;
            denominator_ = -denominator_;
        }
        int x = numerator_ < 0 ? -numerator_ : numerator_;
        int y = denominator_ < 0 ? -denominator_ : denominator_;
        while (x != y) {
            if (x > y) {
                x = x - y;
            }
            else {
                y = y - x;
            }
        }
        numerator_ /= x;
        denominator_ /= x;
    }

    int numerator_;
    int denominator_;
};



int main() {
    Rational r1(1, 2);
    Rational r2(3, 4);
    r1.Addition(r2);
    cout << r1.Numerator() << '/' << r1.Denominator() << endl;
}