## DMPG '18 B2 - Mimi and Modulus

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Points: 3 (partial)
Time limit: 1.0s
Memory limit: 64M

Author:
Problem type

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 to find the greatest result of mod for all integers in the range . Can you help Mimi do her homework?

#### 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