while True:
try:
Amount=input()
lst=Amount.split(" “)
WithAmt=int(lst[0])
TotAmt=float(lst[1])
assert(0<=WithAmt<=2000)
assert(0<=TotAmt<=2000)
break
except AssertionError:
print(“value should be between 0 and 2000”)
except EOFError as e:
print(end=”")
if(WithAmt%5==0 and WithAmt+0.50<=TotAmt):
amt=(TotAmt-WithAmt+0.50)
print("{0:.2f}".format(amt))
else:
print("{0:.2f}".format(TotAmt))