import java.util.Scanner;

public class Main {

	static Scanner scanner;
	public static void main(String[] args) {
	    scanner = new Scanner(System.in);

	    int k=gi();
	    int s=gi();
	    int c=0;
	    for (int i=0; i<=k;i++) {
		    for (int j=0; j<=k;j++) {
                if (i+j<=s && s<=i+j+k) {
                    c++;
                }
		    }
	    }

	    	System.out.println(c);
	    
        //System.out.println(e);
//        if (xo>w || yo>h) {
//        	System.out.print(0);
//        }else {
//        	System.out.print((h-yo)*(w-xo));
//        }


	}

	// 文字列として入力を取得
	public static String gs() {
		return scanner.next();
	}

	// intとして入力を取得
	public static int gi() {
		return Integer.parseInt(scanner.next());
	}

	// longとして入力を取得
	public static long gl() {
		return Long.parseLong(scanner.next());
	}
	
	// doubleとして入力を取得
	public static double gd() {
		return Double.parseDouble(scanner.next());
	}
}
/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