polynomial *calculateExp(expression *exp) {
    //TODO
        term *curkq=new term();
        polynomial *a;
        a=exp->first;
        term *cur;
        term *curnext;
        cur=a->first;
        curnext=a->next->first;

        while(a != NULL)
        {
                //---ADD------
			if( a->op = 0)
			{
				if(cur->somu >= curnext->somu)
				{
					curkq->heso=cur->heso;
					curkq->somu=cur->somu;
					curnext=curnext->next;
				}else
				{
					curkq->heso=curnext->heso;
					curkq->somu=curnext->somu;
					cur=cur->next;
				};
				initZeroPoly()->first=curkq;
				while(((cur != NULL)&&( curnext != NULL))||((cur == NULL)&&( curnext != NULL))||((cur != NULL)&&( curnext == NULL)))
				{   term *kqtam=new term();
					if(cur->somu == curnext->somu)
					{
						kqtam->heso=cur->heso + curnext->heso;
						kqtam->somu=cur->somu;
						cur=cur->next;
						curnext=curnext->next;
					}else if(cur->somu > curnext->somu)
					{
						kqtam->heso=cur->heso;
						kqtam->somu=cur->somu;
						cur=cur->next;
					}else
					{
						kqtam->heso=curnext->heso;
						kqtam->somu=curnext->somu;
						curnext=curnext->next;
					};
					curkq=kqtam;
					kqtam=kqtam->next;
				};
			};
                a=a->next;
        };

    return initZeroPoly();
}