#include <iostream>

using namespace std;

class fraction
{
  protected:
    int top, bot;

  public:
    fraction(int t, int b)
    { top = t;
      bot = b; }

    void print(ostream & out)
    { out << top << "/" << bot << "\n"; }

    fraction mul(fraction other)
    { return fraction(top * other.top, bot * other.bot); } };

int main()
{ fraction a(1, 4), b(3, 7);
  a.print(cout);
  a.top += 1;
  a.print(cout); }