import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		try {
			int k = sc.nextInt();
			int s = sc.nextInt();

			int ans = 0;
			for (int a = 0; a <= k; a++) {
				if (a == s) {
					ans++;
					break;
				}
				int bc  = (int) Math.ceil((double) (s - a) / 2);
				if (bc <= k) {
					for (int b = 0; b <= k; b++) {
						if (s - a - b >= 0 && s - a - b <= k) {
							ans++;
						}
					}
				}
			}

			System.out.println(ans);

		} finally {
			sc.close();
		}
	}
}
/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