#include <iostream>
#include <cmath>

using namespace std;

struct rat
{
    int num;
    int den;
    void makerat(int, int);
    int numer();
    int denom();
    void printrat();
    bool isEqual(int,int);
};

//bool rat::isEqual(rat x, rat y)
//{
 //   double test = static_cast<double>(a) / (double)(1.0 * b);
 //   if(test >= 1)
//}

void rat::printrat()
{
    cout << num << "/" << den << endl;

}

int gcd(int a, int b)
{
    while (a!=b)
        if (a > b) a = a-b;
        else b = b-a;
    return a;
}

void rat::makerat(int a, int b)
{
    if (a == 0)
    {
        num = 0;
        den = b;
    }
    else
    {
        int g = gcd(abs(a), abs(b));

        if (a>0 && b>0 || a<0 && b < 0)
        {
            num = abs(a)/g;
            den = abs(b)/g;
        }
        else
        {
            num = - abs(a)/g;
            den = abs(b)/g;
        }
    }
}

int rat::numer()
{
    return num;
}

int rat::denom()
{
    return den;
}


rat sumrat(rat& r1, rat& r2)
{
    rat r;
    r.makerat(r1.numer() * r2.denom() +  r2.numer() * r1.denom(),  r1.denom() * r2.denom());
    return r;
}

rat subrat(rat& r1, rat& r2)
{
    rat r;
    r.makerat(r1.numer() * r2.denom() -   r2.numer() * r1.denom(), r1.denom() * r2.denom());
    return r;
}

rat multrat(rat& r1, rat& r2)
{
    rat r;
    r.makerat(r1.numer()*r2.numer(),  r1.denom()*r2.denom());
    return r;
}

rat quotrat(rat& r1, rat& r2)
{
    rat r;
    r.makerat(r1.numer()*r2.denom(), r1.denom()*r2.numer());
    return r;
}



int main()
{
    int a1,b1,a2,b2;
    cout<<"Vavedete chislitelia i znamenatelia na pyrwoto chislo: "<<endl;
    cin>>a1>>b1;
    cout<<"Vavedete chislitelia i znamenatelia na vtoroto chislo: "<<endl;
    cin>>a2>>b2;
    rat r1;
    r1.makerat(a1,b1);
    rat r2;
    r2.makerat(a2,b2);
    sumrat(r1, r2).printrat();
    subrat(r1, r2).printrat();
    multrat(r1, r2).printrat();
    quotrat(r1, r2).printrat();
    return 0;
}