OSLO, Norway--menachem Begin and a representative for Anwar Sadat accepted the 1978 Nobel Peace Prize at a royal ceremony yeaterday. while 5000 Norwegians marched in protest nearby.

The demonstration by pro-Palestinians was described by Norwegian officials as the biggest protest of a peace prize selection in the award's 77-year history.

Priase

During the ceremony, Begin praised the Camp David agreements as "a good treaty of peace between countries that decided to put an end of hostility and was and begin a new era of understanding and cooperation."

In a speech read by personal envey Sayed Ahmed Marei. Sadat said he began his peace intiative "because I am convinced that we owe it to this generation not to leave a stone unturned in our pursuit of peace."

Too Busy

Sadat had declined to go to Oslo to receive the prize personally. The official explanation was that he was busy with the peace negotiations. But Egyptian officials said privately Sadat felt he could not meet with Begin while the talks are deadlocked because of what Cairo calls Israeli "stubbornness."