NITK04 - DEEPIKA AND HER BANK ACCOUNT

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Ranbir has deposited some money in Deepika's account. Deepika would like to withdraw X $US from an ATM. The ATM machine will only accept the transaction if X is a multiple of 10, and Deepika'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 Deepika's account balance after an attempted transaction.

Input

The first like contains T ( T<20), the number of Test cases followed by T line containing X and Y each.

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

Nonnegative number 0<= Y <= 2000 with two digits of precision - Deepika'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.

Example

Input:
2
30 120.00 42 120.00
Output:

 89.50
120.00


Added by:Gaurav Jain
Date:2013-09-25
Time limit:1s
Source limit:50000B
Memory limit:1536MB
Cluster: Cube (Intel G860)
Languages:All except: ASM64
Resource:CodeChef