#Write a program that reads first number of items user bought in the store and 
#then price for each item. Program finds the average price per item. USE LOOP 
#FOR
size=int(input("enter number of items you bought the store "))
if(size>0):
	sum=0
	#how many times we need to repeat the loop? size times
	for i in range(size): #i=0, 1, 2, ....size-1 - exactly size times
		print('enter price for customer', i+1)
		#you can use range(1, size+1) and use print(i)
		price=float(input('enter price '))
		sum=sum+price
	print("average", sum/size)
else:
	print("invalid input")