A university sports meeting is about to be held, the school of Economics and Management plans to form a representative team of 12 people to participate in the competition, the players will be selected from the students of 4 grades of the college. College regulations: each grade must choose one or two of the five events in long-distance running, sprint, high jump, long jump, shot put to participate in the competition, the rest of the events can be arbitrary choice; If a grade chooses to run, it cannot choose to sprint or jump; If a grade chooses the long jump, can not choose to run or shot put; Each team member participates in only one event. The number of players selected for the representative team varies from grade to grade. The number of players in two grades multiplied by the number of players in the other grade.
According to the above information, how many people can be selected in a grade?
Seven people