use proconio::input;
use std::cmp::min;

fn solve(k: u32, s: u32) -> u32 {
    let mut result = 0;
    let low = s - min(s, 2 * k);

    for i in low..=k {
        for j in low..=k {
            for h in low..=k {
                if i + j + h == s {
                    result += 1;
                }
            }
        }
    }

    return result;
}

fn main() {
    input! {
        k: u32,
        s: u32,
    };

    assert!(s <= 3 * k);

    println!("{}", solve(k, s));
}