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?
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
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