Countit :
Difficulty Level : Easy
Submissions : 261
Asked In :
Marks :10
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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 $$$K \leq 5000$$$ and $$$S \leq 3*K$$$ respectively
Output
Print the number of ways of distributing candies
Examples
Input
5 15
Output
1
Input
1 2
Output
3
