#include <iostream>
#include <string>
#include <cstdio>

using namespace std;

class Drob
{
public:
    int chisl, znam;

    Drob() : chisl(1), znam(1) {}

    Drob(int chisl, int znam) : chisl(chisl), znam(znam) {}

    double value()
    {
        return ((double)chisl) / znam;
    }

    void print()
    {
        cout << chisl << "/" << znam;
    }

    Drob add(Drob a)
    {
        int tchisl = chisl * a.znam + a.chisl * znam;
        int tznam = znam * a.znam;

        return Drob(tchisl, tznam);
    }
};

int main()
{
    //freopen("output.txt", "w", stdout);

    Drob a;
    a.print();
    cout << "\n";

    Drob b(3, 5);
    b.print();
    cout << "\n";

    Drob c = a.add(b);
    c.print();
    cout << "\n";

    //getc(stdin);
    return 0;
}