def tax(price):
tax = None
# YOUR CODE GOES HERE
def tax(price):
tax = None
if price > 100000 :
tax = (float(price * 20 / 100))
elif price > 75000 and price <= 100000 :
tax = (float(price * 15 / 100))
elif price > 50000 and price <= 75000 :
tax = (float(price * 10 / 100))
else:
tax = (float(price * 5 / 100))
return tax
price = int(input())
print(tax(price))