#problem 10 from 
#http://cs.widener.edu/~yanako/html/courses/Fall20/csci151/func.html
def ticket_cost(age, price):
	if(age<=5):
		final=0
	elif(age<=10):
		final=price/2 #final=price-price*50/100
	elif(age<=13):
		final=price-price*25/100
	elif(age<=18):
		final=price-price*10/100
	else:
		final=price
	#we assume age is valid
	return final 
def main():
	price=float(input("enter price "))
	tax=int(input("tax "))
	total=0
	for i in range(4):
		age=int(input("enter age "))
		if(age>0):
			final=ticket_cost(age, price)	
			total=total+final
		else:
			print("invalid age")
	print("total with tax is", format(total+total*tax/100, ".2f"))
main()