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Points:
3 (partial)

Time limit:
1.0s

Memory limit:
64M

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The modulo operator is a very commonly used operation in computer science. The result of taking modulo is equal to the remainder of when divided by .

For her ICS homework, Mimi was asked the find the greatest result of mod for all integers in the range . Can you help Mimi do her homework?

#### Constraints

##### Subtask 1 [40%]

##### Subtask 2 [60%]

#### Input Specification

The first and only line of input will contain two space separated integers, and .

#### Output Specification

The greatest result of mod for all integers in the range .

#### Sample Input

`5 3`

#### Sample Output

`2`

## Comments