#include <iostream>
#include <iomanip>
using namespace std;
int del(int a, int b) {
    if (!b) {
        return a;
    }
    return (b, a % b);
}
class Rational {
    public:
    int a,b;
    Rational& Add(Rational const & q) {
        int one = a * q.b + b * q.a;
        int two = b * q.b;
        a = a / del(one, two);
        b = b / del(one, two);
        return *this;
    }
    Rational& Substruct(Rational const &q) {
        int one = a * q.b - b * q.a;
        int two = b * q.b;
        a = a / del(one, two);
        b = b / del(one, two);
        return *this;
    }
    Rational& Multiply(Rational const &q) {
        int one = a * q.a;
        int two = b * q.b;
        a = one / del(one, two);
        b = two / del(one, two);
        return *this;
    }
    Rational& Divide(Rational const &q) {
        int one = a * q.b;
        int two = b * q.a;
        a = one / del(one, two);
        b = two / del(one, two);
        return *this;
    }
    Rational(int c, int d) {
        a = c / del(c, d);
        b = d / del(c, d);
    }
};
int main()
{
    Rational a(1,2);
    Rational b(2,4);
    a.Add(b).Multiply(b);
    return 0;
}