#include <iostream>
#include <cmath>

using namespace std;

class Rational {
public:
    Rational() {
        up = 0;
        down = 1;
    }

    Rational(int numerator, int denomirator) {
        if (numerator != 0) {
            if (numerator < 0 && denomirator < 0) {
                up = -numerator;
                down = -denomirator;
            } else if (numerator > 0 && denomirator < 0){
                up = -numerator;
                down = -denomirator;
            } else {
                up = numerator;
                down = denomirator;
            }
        } else {
            up = 0;
            down = 1;
        }
        Optimize();
    }

    int Numerator() const {
        return up;
    }

    int Denominator() const {
        return down;
    }

private:
    void Optimize() {
        int uni = gcd(up, down);
        while (uni != 1) {
            up = up / uni;
            down = down / uni;
            uni = gcd(up, down);
        }

    }

    static int gcd(int c, int d) {
        while (d) {
            c %= d;
            swap(c, d);
        }
        return c;
    }

    int up;
    int down;
};

int main() {
    {
        const Rational r(3, 10);
        if (r.Numerator() != 3 || r.Denominator() != 10) {
            cout << "Rational(3, 10) != 3/10" << endl;
            return 1;
        }
    }

    {
        const Rational r(8, 12);
        if (r.Numerator() != 2 || r.Denominator() != 3) {
            cout << "Rational(8, 12) != 2/3" << endl;
            return 2;
        }
    }

    {
        const Rational r(-4, 6);
        if (r.Numerator() != -2 || r.Denominator() != 3) {
            cout << "Rational(-4, 6) != -2/3" << endl;
            return 3;
        }
    }

    {
        const Rational r(4, -6);
        if (r.Numerator() != -2 || r.Denominator() != 3) {
            cout << "Rational(4, -6) != -2/3" << endl;
            return 3;
        }
    }

    {
        const Rational r(0, 15);
        if (r.Numerator() != 0 || r.Denominator() != 1) {
            cout << "Rational(0, 15) != 0/1" << endl;
            return 4;
        }
    }

    {
        const Rational defaultConstructed;
        if (defaultConstructed.Numerator() != 0 || defaultConstructed.Denominator() != 1) {
            cout << "Rational() != 0/1" << endl;
            return 5;
        }
    }

    cout << "OK" << endl;
    return 0;
}