#include <iostream>
using namespace std;

struct Fraccio {
 int num, den;
};

int mcd (int den1, int den2){
    while (den2!=0){
    int s = den1%den2;
    den1=den2;
    den2=s;
  }
  return den1;
}

int mcm(int den1,int den2){
  int j=den1/mcd(den1,den2)*den2;
  return j;
}

Fraccio suma(const Fraccio& x, const Fraccio& y){
  int m_c_m = mcm(x.den, y.den);
  Fraccio auxiliar;
  auxiliar.den = m_c_m;
  auxiliar.num = ((m_c_m/x.den)*x.num + (m_c_m/y.den)*y.num);
  int m_c_d = mcd (auxiliar.num, auxiliar.den);
  auxiliar.num/=m_c_d;
  auxiliar.den/=m_c_d;
  return auxiliar;
}


int main (){
  Fraccio v1,v2,aux;
  char c;
  cin >> v1.num >> c >> v1.den >> c;
  aux=v1;
  while (c!= '='){
    cin >> v2.num >> c >> v2.den;
    aux = suma(v1,v2);
    v1=aux;
    cin >> c;
  }
  cout << aux.num << "/" << aux.den << endl;
}