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2014-11Gr-10. 50430 - ATM

Epoka Science Olympiad 2013-2015

Start: May.18.2013 at 10:00:00 AM
Finish: May.18.2013 at 03:00:00 PM
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• 2014-11Gr-10. 50430 - ATM
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Time limit 2000/4000/4000/4000 ms. Memory limit 65000/65000/65000/65000 Kb.
Question by Halil Karimis.

ATM

Question: Ardit 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 Ardit'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 Ardit's account balance after an attempted transaction.

Input specification
Positive integer X (0 < X ≤ 2000) - the amount of cash which Ardit wishes to withdraw.
Nonnegative number Y (0 ≤ Y ≤ 2000) - Ardit's initial account balance.

Output specification
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 or X is not a multiple of 5, output the current bank balance.

 Sample Input I     Sample Input II     Sample Input III   
 30 90.56789
 42 120.00
 300 120.00
 Sample Output I     Sample Output II     Sample Output III   
 60.07
 120.00
 120.00

Explanation:

  1. Regular transaction
  2. The amount to withdraw is not a multiple of 5
  3. The amount to withdraw is greater than the amount he has in the account

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