Withdraw money from ATM

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Problem statement

Alice 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 Alice'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 Alice's account balance after an attempted transaction.

Input format

Positive integer 0 < X <= 2000 - the amount of cash which Alice wishes to withdraw.
Nonnegative number 0<= Y <= 2000 with two digits of precision - Alice's initial account balance.

Output format

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.

Constraints

0 < X <= 2000 the amount of cash which Alice wishes to withdraw.
0<= Y <= 2000 with two digits of precision - Alice's initial account balance.

Sample Input 1

30 120.00

Sample output 1

89.50

Explanation

Initial balance was 120.0 and Alice withdraw 30.00 bank charges is 0.50. Hence, balance will be 120.0 - 30.50 = 89.50

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