Countit :
Difficulty Level : Easy
Submissions : 270
Asked In :
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Count the number of ways to distribute S candies to 3 children such that no child gets more than K candies.
Input
First line contains 2 integers K≤5000 and S≤3∗K respectively
Output
Print the number of ways of distributing candies
Examples
Input
5 15
Output
1
Input
1 2
Output
3
