import java.lang.*;
import java.io.*;
import java.util.*;


public class Main {

	public static void main(String[] args) throws java.lang.Exception {
		InputStream inputStream = System.in;
		OutputStream outputStream = System.out;
		InputReader in = new InputReader(inputStream);
		PrintWriter out = new PrintWriter(outputStream);
		TaskA solver = new TaskA();
		solver.solve(in, out);
		out.close();
	}
}

class TaskA {

	public void solve(InputReader in, PrintWriter out) {
		int k = in.nextInt(), s = in.nextInt();
		int x, y, z;
		int ans = 0;

		for (x=0; x<=k&&x<=s; ++x) {
			for (y=0; y<=k&&x+y<=s; ++y) {
				z = s - (x + y);
				if (z>=0 && z<=k)
					++ans;
			}
		}

		out.println(ans);
	}
}


class InputReader {
	public BufferedReader reader;
	public StringTokenizer tokenizer;


	public InputReader(InputStream stream) {
		reader = new BufferedReader(new InputStreamReader(stream), 32768);
		tokenizer = null;
	}

	public String next() {
		while (tokenizer==null || !tokenizer.hasMoreTokens()) {
			try {
				tokenizer = new StringTokenizer(reader.readLine());
			} catch (IOException e) {
				throw new RuntimeException(e);
			}
		}
		return tokenizer.nextToken();
	}

	public int nextInt()  {
		return Integer.parseInt(next());
	}

	public long nextLong() {
		return Long.parseLong(next());
	}

	public double nextDouble() {
		return Double.parseDouble(next());
	}
} import java.lang.*; lang.* java import java.io.*; io.* java import java.util.*; util.* java public class Main {

	public static void main(String[] args) throws java.lang.Exception {
		InputStream inputStream = System.in;
		OutputStream outputStream = System.out;
		InputReader in = new InputReader(inputStream);
		PrintWriter out = new PrintWriter(outputStream);
		TaskA solver = new TaskA();
		solver.solve(in, out);
		out.close();
	}
} Main public static void main(String[] args) throws java.lang.Exception {
		InputStream inputStream = System.in;
		OutputStream outputStream = System.out;
		InputReader in = new InputReader(inputStream);
		PrintWriter out = new PrintWriter(outputStream);
		TaskA solver = new TaskA();
		solver.solve(in, out);
		out.close();
	} main {
		InputStream inputStream = System.in;
		OutputStream outputStream = System.out;
		InputReader in = new InputReader(inputStream);
		PrintWriter out = new PrintWriter(outputStream);
		TaskA solver = new TaskA();
		solver.solve(in, out);
		out.close();
	} InputStream inputStream = System.in; inputStream System.in System System.in OutputStream outputStream = System.out; outputStream System.out System System.out InputReader in = new InputReader(inputStream); in new InputReader(inputStream) PrintWriter out = new PrintWriter(outputStream); out new PrintWriter(outputStream) TaskA solver = new TaskA(); solver new TaskA() solver.solve(in, out) solver.solve solver in out out.close() out.close out String[] args args class TaskA {

	public void solve(InputReader in, PrintWriter out) {
		int k = in.nextInt(), s = in.nextInt();
		int x, y, z;
		int ans = 0;

		for (x=0; x<=k&&x<=s; ++x) {
			for (y=0; y<=k&&x+y<=s; ++y) {
				z = s - (x + y);
				if (z>=0 && z<=k)
					++ans;
			}
		}

		out.println(ans);
	}
} TaskA public void solve(InputReader in, PrintWriter out) {
		int k = in.nextInt(), s = in.nextInt();
		int x, y, z;
		int ans = 0;

		for (x=0; x<=k&&x<=s; ++x) {
			for (y=0; y<=k&&x+y<=s; ++y) {
				z = s - (x + y);
				if (z>=0 && z<=k)
					++ans;
			}
		}

		out.println(ans);
	} solve {
		int k = in.nextInt(), s = in.nextInt();
		int x, y, z;
		int ans = 0;

		for (x=0; x<=k&&x<=s; ++x) {
			for (y=0; y<=k&&x+y<=s; ++y) {
				z = s - (x + y);
				if (z>=0 && z<=k)
					++ans;
			}
		}

		out.println(ans);
	} int k = in.nextInt() k in.nextInt() in.nextInt in s = in.nextInt(); s in.nextInt() in.nextInt in int x x y y z; z int ans = 0; ans 0 for (x=0; x<=k&&x<=s; ++x) {
			for (y=0; y<=k&&x+y<=s; ++y) {
				z = s - (x + y);
				if (z>=0 && z<=k)
					++ans;
			}
		} x=0; x=0 x 0 x<=k&&x<=s x<=k x k x<=s x s ++x ++x x {
			for (y=0; y<=k&&x+y<=s; ++y) {
				z = s - (x + y);
				if (z>=0 && z<=k)
					++ans;
			}
		} {
			for (y=0; y<=k&&x+y<=s; ++y) {
				z = s - (x + y);
				if (z>=0 && z<=k)
					++ans;
			}
		} for (y=0; y<=k&&x+y<=s; ++y) {
				z = s - (x + y);
				if (z>=0 && z<=k)
					++ans;
			} y=0; y=0 y 0 y<=k&&x+y<=s y<=k y k x+y<=s x+y x y s ++y ++y y {
				z = s - (x + y);
				if (z>=0 && z<=k)
					++ans;
			} {
				z = s - (x + y);
				if (z>=0 && z<=k)
					++ans;
			} z = s - (x + y) z s - (x + y) s (x + y) x y if (z>=0 && z<=k)
					++ans; z>=0 && z<=k z>=0 z 0 z<=k z k ++ans ans out.println(ans) out.println out ans InputReader in in PrintWriter out out class InputReader {
	public BufferedReader reader;
	public StringTokenizer tokenizer;


	public InputReader(InputStream stream) {
		reader = new BufferedReader(new InputStreamReader(stream), 32768);
		tokenizer = null;
	}

	public String next() {
		while (tokenizer==null || !tokenizer.hasMoreTokens()) {
			try {
				tokenizer = new StringTokenizer(reader.readLine());
			} catch (IOException e) {
				throw new RuntimeException(e);
			}
		}
		return tokenizer.nextToken();
	}

	public int nextInt()  {
		return Integer.parseInt(next());
	}

	public long nextLong() {
		return Long.parseLong(next());
	}

	public double nextDouble() {
		return Double.parseDouble(next());
	}
} InputReader public BufferedReader reader; reader public StringTokenizer tokenizer; tokenizer public InputReader(InputStream stream) {
		reader = new BufferedReader(new InputStreamReader(stream), 32768);
		tokenizer = null;
	} InputReader {
		reader = new BufferedReader(new InputStreamReader(stream), 32768);
		tokenizer = null;
	} reader = new BufferedReader(new InputStreamReader(stream), 32768) reader new BufferedReader(new InputStreamReader(stream), 32768) tokenizer = null tokenizer null InputStream stream stream public String next() {
		while (tokenizer==null || !tokenizer.hasMoreTokens()) {
			try {
				tokenizer = new StringTokenizer(reader.readLine());
			} catch (IOException e) {
				throw new RuntimeException(e);
			}
		}
		return tokenizer.nextToken();
	} next {
		while (tokenizer==null || !tokenizer.hasMoreTokens()) {
			try {
				tokenizer = new StringTokenizer(reader.readLine());
			} catch (IOException e) {
				throw new RuntimeException(e);
			}
		}
		return tokenizer.nextToken();
	} while (tokenizer==null || !tokenizer.hasMoreTokens()) {
			try {
				tokenizer = new StringTokenizer(reader.readLine());
			} catch (IOException e) {
				throw new RuntimeException(e);
			}
		} tokenizer==null || !tokenizer.hasMoreTokens() tokenizer==null tokenizer null !tokenizer.hasMoreTokens() tokenizer.hasMoreTokens() tokenizer.hasMoreTokens tokenizer {
			try {
				tokenizer = new StringTokenizer(reader.readLine());
			} catch (IOException e) {
				throw new RuntimeException(e);
			}
		} try {
				tokenizer = new StringTokenizer(reader.readLine());
			} catch (IOException e) {
				throw new RuntimeException(e);
			} catch (IOException e) {
				throw new RuntimeException(e);
			} IOException e {
				throw new RuntimeException(e);
			} throw new RuntimeException(e); new RuntimeException(e) {
				tokenizer = new StringTokenizer(reader.readLine());
			} tokenizer = new StringTokenizer(reader.readLine()) tokenizer new StringTokenizer(reader.readLine()) return tokenizer.nextToken(); tokenizer.nextToken() tokenizer.nextToken tokenizer public int nextInt()  {
		return Integer.parseInt(next());
	} nextInt {
		return Integer.parseInt(next());
	} return Integer.parseInt(next()); Integer.parseInt(next()) Integer.parseInt Integer next() next public long nextLong() {
		return Long.parseLong(next());
	} nextLong {
		return Long.parseLong(next());
	} return Long.parseLong(next()); Long.parseLong(next()) Long.parseLong Long next() next public double nextDouble() {
		return Double.parseDouble(next());
	} nextDouble {
		return Double.parseDouble(next());
	} return Double.parseDouble(next()); Double.parseDouble(next()) Double.parseDouble Double next() next public class Main {

	public static void main(String[] args) throws java.lang.Exception {
		InputStream inputStream = System.in;
		OutputStream outputStream = System.out;
		InputReader in = new InputReader(inputStream);
		PrintWriter out = new PrintWriter(outputStream);
		TaskA solver = new TaskA();
		solver.solve(in, out);
		out.close();
	}
} public class Main {

	public static void main(String[] args) throws java.lang.Exception {
		InputStream inputStream = System.in;
		OutputStream outputStream = System.out;
		InputReader in = new InputReader(inputStream);
		PrintWriter out = new PrintWriter(outputStream);
		TaskA solver = new TaskA();
		solver.solve(in, out);
		out.close();
	}
} Main
import java.lang.*;
import java.io.*;
import java.util.*;


public class Main {

	public static void main(String[] args) throws java.lang.Exception {
		InputStream inputStream = System.in;
		OutputStream outputStream = System.out;
		InputReader in = new InputReader(inputStream);
		PrintWriter out = new PrintWriter(outputStream);
		TaskA solver = new TaskA();
		solver.solve(in, out);
		out.close();
	}
}

class TaskA {

	public void solve(InputReader in, PrintWriter out) {
		int k = in.nextInt(), s = in.nextInt();
		int x, y, z;
		int ans = 0;

		for (x=0; x<=k&&x<=s; ++x) {
			for (y=0; y<=k&&x+y<=s; ++y) {
				z = s - (x + y);
				if (z>=0 && z<=k)
					++ans;
			}
		}

		out.println(ans);
	}
}


class InputReader {
	public BufferedReader reader;
	public StringTokenizer tokenizer;


	public InputReader(InputStream stream) {
		reader = new BufferedReader(new InputStreamReader(stream), 32768);
		tokenizer = null;
	}

	public String next() {
		while (tokenizer==null || !tokenizer.hasMoreTokens()) {
			try {
				tokenizer = new StringTokenizer(reader.readLine());
			} catch (IOException e) {
				throw new RuntimeException(e);
			}
		}
		return tokenizer.nextToken();
	}

	public int nextInt()  {
		return Integer.parseInt(next());
	}

	public long nextLong() {
		return Long.parseLong(next());
	}

	public double nextDouble() {
		return Double.parseDouble(next());
	}
}
