Problem Statement

You are given two integers $K$ and $S$. Three variable $X, Y$ and $Z$ takes integer values satisfying $0≤X,Y,Z≤K$. How many different assignments of values to $X, Y$ and $Z$ are there such that $X + Y + Z = S$?

Constraints

• $2≤K≤2500$
• $0≤S≤3K$
• $K$ and $S$ are integers.

Input

The input is given from Standard Input in the following format:

K S

Output

Print the number of the triples of $X, Y$ and $Z$ that satisfy the condition.