public class Bruch {

    /* attributes */
    int zaehler;
    int nenner;

    /* constructor */

    Bruch (int z, int n) {
        zaehler = z;
        nenner = n;
    }

    /* Addition */

    void add(Bruch r) {
        zaehler = zaehler*r.nenner + r.zaehler*nenner;
        nenner  = nenner*r.nenner;
    }

    public String toString() {
        return "(" + zaehler + "/" + nenner + ")";
    }

}