Question on permutations please!!!!!?

A student is preparing a course scedule for the next semester. The student may select one of two mathematics courses, one of three science courses, and one of five courses from the social sciences and humanities. How many schedules are possible?.....Please help I think u use the formula nPr= n!/(n-r)! however i dont know how you find out which! Please show me how u solved THANKS!