Pooja would like to withdraw X $US from an ATM. The cash machine will only accept the transaction if X is a multiple of 5, and Pooja's account balance has enough cash to perform the withdrawal transaction (including bank charges). For each successful withdrawal the bank charges 0.50 $US. Calculate Pooja's account balance after an attempted transaction.

Programming Language : Python

Input

Positive integer 0 < X <= 2000 - the amount of cash which Pooja wishes to withdraw.

Nonnegative number 0<= Y <= 2000 with two digits of precision - Pooja's initial account balance.

Output

Output the account balance after the attempted transaction, given as a number with two digits of precision. If there is not enough money in the account to complete the transaction, output the current bank balance.

Question Source

Code :

x, y = input().split()
x, y = int(x), float(y)
if (y-0.5) >= x and x % 5 == 0:
    z = (y-x)-0.5
    print('%.2f' % z)
else:
    print('%.2f' % y)

Outputs :

1. Successful Transaction - 

35 121.00

85.50

2. Incorrect Withdrawal Amount (not multiple of 5) -

43 121.00

121.00

3. Insufficient Funds - 

305 121.00

121.00