unit = int(input("Enter The Electric Unit : "))
amount = 0
if unit <= 50:
    amount = unit * 0.5
elif unit > 50 and unit <= 150:
    amount = 25 + ((unit - 50)*0.75)
elif unit > 150 and unit <= 250:
    amount = 100 + ((unit - 150)*1.2) 
else:
    amount = 200 + ((unit-250)*1.5)
charge = amount * 0.2
total = charge + amount
print("Electric Bill Amount Is : ",total)

# Coded By DHIRAJ SHELKE