A country adheres in one of five groups I-V. A country adhering in Group I, II, III, IV, or V has, respectively, 1, 2, 3, 4, or 5 votes in mail ballots and in the IMU General Assembly. Countries in Groups I, II, III, IV, and V make annual financial contributions to IMU in the proportions 1:2:4:8:12. The following countries are members of the International Mathematical Union