Li Lei is a student at middle school.
Every week,he will learn some course according to the schedule for courses.
On Mondy,he joins two classes,Maths and Chinese.The next day,he need to join Maths and English.On Wednesday,he will take part in three courses,include Mahts,Chinese and Sports.Then ,he need to join Chinese class and English class on Thursday.On the last day of week,he will join four classes,Maths,Chinese,English and Sports.