namespace MyVendorMyModuleObserver;


class TotalCalcScore implements MagentoFrameworkEventObserverInterface
{

    protected $_product;


    public function __construct(
        MagentoCatalogModelProductFactory $product
    ) {
        $this->_product = $product;
    }


    public function execute(
        MagentoFrameworkEventObserver $observer
    )
    {
   $productIds = $observer->getProductIds();
    foreach($productIds as $id){
    $product = $this->_product->create()->load($id);

            if($product->getId()){


                // attribute_first_count
                $value_offirst_count = $product->getattribute_first_count();
                // attribute_second_count
                $value_offsecond_score = $product->getattribute_second_count();
               // attribute_calculated_count
                $value_calculated_score = $product->getattribute_calculated_count();



                // calculate
         $value_calculated_score = $value_offsecond_score + $value_offirst_count

                //save calculated value
                //$product->setCalculatedValue($value_calculated_score);
                //save to attribute_calculated_score
                $product->setAttrCalculatedScore($value_calculated_score);

                $product->save();
}

    }
}