#include <iostream>
#include <clocale>
using namespace std;
int main()
{
  int a, b, c, d, p, q;
  setlocale(LC_CTYPE,"rus");
  cout<<"Îá÷èñëèìî a/b + c/d\n";
  cout<<"Ââåäiòü a, b, c, d\n";
  cin>>a>>b>>c>>d;
  cout<<a<<"/"<<b<<" + "<<c<<"/"<<d<<" = ";
  p = a * d + b * c;
  q = b * d;
  a = p;
  b = q;
  for (; b > 0;)
  {
    c = a % b;
    a = b;
    b = c;
  }
  p = p / a;
  q = q / a;
  if ((p / q) != 0) cout<<p/q;
  if (((p / q) != 0) and ((p % q) != 0)) cout<<" + ";
  if ((p % q) != 0) cout<<p%q<<"/"<<q;
  return 0;
}