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 lines each containing X and Y.

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