#lab 7 assignment with functions


def main():
	#input
	price1=float(input("enter price of first item "))
	cat1=int(input("category for 1 item "))
	price2=float(input("enter price of second item "))
	cat2=int(input("category for 2 item "))
	price3=float(input("enter price of third item "))
	cat3=int(input("category for 3 item "))
	tax=int(input("enter tax "))

	validity1=valid_input(price1, cat1)
	validity2=valid_input(price2,cat2)
	validity3=valid_input(price3, cat3)

	if(validity1 and validity2 and validity3):
		cost1=item_cost(price1, cat1, tax)
		cost2=item_cost(price2, cat2, tax)
		cost3=item_cost(price3, cat3, tax)
		total_cost=total(cost1, cost2, cost3)
		if(total_cost>=40):
			print("final price", total_cost-10)
		else:
			print("final price", total_cost)
	else:
		print("NO VALID INPUT")		



def item_cost(price, category, tax):
	if(category==1):
		discount=10/100
	elif(category==2):
		discount=15/100
	else:
		discount=30/100

	cost=(price-price*discount)*(1+tax/100)

	return cost

def total(item1, item2, item3):
	return(item1+item2+item3)

def valid_input(price, category):
	cond1=(price>=0)
	cond2=(category==1) or (category==2)or (category==3)
	
	if(cond1 and cond2):
		return True
	else:
		return False
	
main()