#Write a program that calculates the total cost of amusement park 
#ticket.

#Input: full price of the ticket (float) and age of the person 
#(integer).

#Output: Total price after discount is taken

#Ticket Price Rules:

#    age 0-5: free
#    age 6 - 18: 25% discount
#    19 and older: full price

#We will check validity of the input.
#Input
age=int(input("enter age "))
price=float(input("enter price "))
#Assuming the Input is VALID in this solution
if price>0:
	if 0<age<=5:
		final=0
		print("final price is", format(final,".2f"))
	elif 6<=age<=18:
		final=price-price*25/100 
		#or you can write: final=price*75/100
		print("final price is", format(final,".2f"))
	elif age>=19:
		final=price
		print("final price is", format(final,".2f"))
	else:
		print("invalid input for age")
else:
	print("invalid input for price")