## NITK04 - DEEPIKA AND HER BANK ACCOUNT

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 42 120.00Output: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 |