import java.util.*;
// warm-up
public class Main {

	static void solve() {
		Scanner sc = new Scanner(System.in);
		int K = sc.nextInt(), s = sc.nextInt(), t=0;
		Map<Integer, Integer> m = new HashMap<Integer, Integer>();
		for (int i=0; i<=K; i++) {
			for (int j=0; j<=K; j++) {
				m.put(i+j, m.get(i+j)==null ? 1 : m.get(i+j)+1);
			}
		}
		for (int k=0; k<=K; k++) if (m.containsKey(s-k)) t+=m.get(s-k);
		System.out.println(t);
		sc.close();			
	}

	public static void main(String args[]) {
		solve();
	}

}
/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