sentences:  Average cost for the Summer Games since 1960 is US$5.2 billion.Because of the U.S. boycott, changes were made to the traditional elements of the closing ceremony that represent the handover to the host city of the next Summer Olympics in Los Angeles.Among them, the flag of the city of Los Angeles instead of the United States flag was raised, and the Olympic Anthem instead of the national anthem of the United States was played.