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

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

#Output: Total price after discount and taxes are taken in account. 
#TAX APPLIED AFTER DISCOUNT.
#Ticket Price Rules:

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

#Assume that input is valid.


#Input

age=int(input("enter age "))
price=float(input("enter price "))
tax=int(input("enter tax "))

#Assuming the Input is VALID in this solution
if(age<=5):
	final=0
elif(age<=18):
	final_pre_tax=price-price*25/100
	final=final_pre_tax*(1+tax/100)	 
else:
	final=price*(1+tax/100)

print("final price is", format(final,".2f"))