gistfile1.txt

        if num_days <= 3:
            if order_is_shipping:
                price = model.three_day_rate * qty
            else:
                price = model.four_day_rate * qty
        elif num_days == 4:
            price = model.four_day_rate * qty
        elif num_days > 4:
            days_amount = max(0, self._calculate_price_for_days(num_days-4, qty=qty, model=model))
            price = (model.four_day_rate * qty) + days_amount

        ship_cost = max(0,model.shipping_cost) * qty if add_ship_cost else Decimal('0')
        total = price + ship_cost