import java.util.Scanner;

public class Main {
    private static Scanner scanner = new Scanner(System.in);

    public static void main(String[] args) {
        int k = scanner.nextInt();
        int s = scanner.nextInt();
        int answer = 0;
        for (int x = 0; x <= k; x++)
            answer += (s - x + 1) - Math.min(s - x + 1, Math.max(0, ((s - x - k) * 2)));
        System.out.println(answer);
    }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz