#Program 1:Student takes certain amount of courses during the academic 
#year. Write a program that reads number of courses and final 
#grade for each course, and finds the average final grade for 
#the academic year.MUST USE LOOP FOR Everything in MAIN
def main():
	n = int(input("enter number of courses "))
	total=0
	for i in range(n):
		grade=int(input("enter grade "))
		total=total+grade
	if(n>0):
		ave=total/n
		print(ave)
	else:
		print("didn't take any course")

main()