By 1987, mathematical organizations or institutions in 53 countries or regions are members of the International Mathematical Federation. They are divided into five groups according to the number of votes in Congress, and the number of votes (impromptu number) and membership fees paid by each group are different. The first group includes Cameroon, Chile, Cuba, Egypt, Greece, Hong Kong, Iceland, Iran, Democratic People's Republic of Korea, South Korea, Malaysia, Mexico, New Zealand, Nigeria, Norway, Philippines, Portugal, Singapore, Turkey, Vietnam and C? te d 'Ivoire. The second group includes Argentina, Austria, Bulgaria, Denmark, Finland, Ireland, Israel, Pakistan, Romania, South Africa, Spain and Yugoslavia. The third group includes Australia, Belgium, Brazil, Czechoslovakia, German Democratic Republic, Hungary, India, Netherlands, Poland, Sweden and Switzerland. The fourth group has Canada and Italy; The fifth group includes China, France, Germany, Japan, Britain, the Soviet Union and the United States.