import java.util.*;

final class Solver {
	static final Solver INSTANCE = new Solver();

	void solve(Iterator<String> sc) {
		int K = Integer.parseInt(sc.next());
		int S = Integer.parseInt(sc.next());
		int sum = 0;
		for (int x = 0; x <= K && x <= S; x++) {
			int remaining = S - x;
			sum += Math.max(Math.min(remaining, K) - Math.max(remaining - K, 0) + 1, 0);
		}
		System.out.println(sum);
	}
}

class Main {
	public static void main(String... args) {
		Solver.INSTANCE.solve(new Scanner(System.in));
	}
}
/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