import java.util.Scanner;

/**
 *
 * @author k16075kk
 */
public class Main {

    /**
     * @param args the command line arguments
     */
    static char[] xx = new char[]{'S', 'H', 'C', 'D'};

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        while (true) {
            int n = sc.nextInt();
            int x = sc.nextInt();
            if (n == 0 && x == 0) {
                break;
            }
            int count = 0;
            for (int i = 1; i <= n; i++) {
                for (int j = i + 1; j <= n; j++) {
                    for (int k = j + 1; k <= n; k++) {
                        if (i + j + k == x) {
                            count++;
                        }
                    }
                }
            }
            System.out.println(count);
        }

    }

}
 import java.util.Scanner; Scanner java.util public class Main {

    /**
     * @param args the command line arguments
     */
    static char[] xx = new char[]{'S', 'H', 'C', 'D'};

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        while (true) {
            int n = sc.nextInt();
            int x = sc.nextInt();
            if (n == 0 && x == 0) {
                break;
            }
            int count = 0;
            for (int i = 1; i <= n; i++) {
                for (int j = i + 1; j <= n; j++) {
                    for (int k = j + 1; k <= n; k++) {
                        if (i + j + k == x) {
                            count++;
                        }
                    }
                }
            }
            System.out.println(count);
        }

    }

} Main /**
     * @param args the command line arguments
     */
    static char[] xx = new char[]{'S', 'H', 'C', 'D'}; xx new char[]{'S', 'H', 'C', 'D'} public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        while (true) {
            int n = sc.nextInt();
            int x = sc.nextInt();
            if (n == 0 && x == 0) {
                break;
            }
            int count = 0;
            for (int i = 1; i <= n; i++) {
                for (int j = i + 1; j <= n; j++) {
                    for (int k = j + 1; k <= n; k++) {
                        if (i + j + k == x) {
                            count++;
                        }
                    }
                }
            }
            System.out.println(count);
        }

    } main {
        Scanner sc = new Scanner(System.in);
        while (true) {
            int n = sc.nextInt();
            int x = sc.nextInt();
            if (n == 0 && x == 0) {
                break;
            }
            int count = 0;
            for (int i = 1; i <= n; i++) {
                for (int j = i + 1; j <= n; j++) {
                    for (int k = j + 1; k <= n; k++) {
                        if (i + j + k == x) {
                            count++;
                        }
                    }
                }
            }
            System.out.println(count);
        }

    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) while (true) {
            int n = sc.nextInt();
            int x = sc.nextInt();
            if (n == 0 && x == 0) {
                break;
            }
            int count = 0;
            for (int i = 1; i <= n; i++) {
                for (int j = i + 1; j <= n; j++) {
                    for (int k = j + 1; k <= n; k++) {
                        if (i + j + k == x) {
                            count++;
                        }
                    }
                }
            }
            System.out.println(count);
        } true {
            int n = sc.nextInt();
            int x = sc.nextInt();
            if (n == 0 && x == 0) {
                break;
            }
            int count = 0;
            for (int i = 1; i <= n; i++) {
                for (int j = i + 1; j <= n; j++) {
                    for (int k = j + 1; k <= n; k++) {
                        if (i + j + k == x) {
                            count++;
                        }
                    }
                }
            }
            System.out.println(count);
        } int n = sc.nextInt(); n sc.nextInt() sc.nextInt sc int x = sc.nextInt(); x sc.nextInt() sc.nextInt sc if (n == 0 && x == 0) {
                break;
            } n == 0 && x == 0 n == 0 n 0 x == 0 x 0 {
                break;
            } break; int count = 0; count 0 for (int i = 1; i <= n; i++) {
                for (int j = i + 1; j <= n; j++) {
                    for (int k = j + 1; k <= n; k++) {
                        if (i + j + k == x) {
                            count++;
                        }
                    }
                }
            } int i = 1; int i = 1; i 1 i <= n i n i++ i++ i {
                for (int j = i + 1; j <= n; j++) {
                    for (int k = j + 1; k <= n; k++) {
                        if (i + j + k == x) {
                            count++;
                        }
                    }
                }
            } {
                for (int j = i + 1; j <= n; j++) {
                    for (int k = j + 1; k <= n; k++) {
                        if (i + j + k == x) {
                            count++;
                        }
                    }
                }
            } for (int j = i + 1; j <= n; j++) {
                    for (int k = j + 1; k <= n; k++) {
                        if (i + j + k == x) {
                            count++;
                        }
                    }
                } int j = i + 1; int j = i + 1; j i + 1 i 1 j <= n j n j++ j++ j {
                    for (int k = j + 1; k <= n; k++) {
                        if (i + j + k == x) {
                            count++;
                        }
                    }
                } {
                    for (int k = j + 1; k <= n; k++) {
                        if (i + j + k == x) {
                            count++;
                        }
                    }
                } for (int k = j + 1; k <= n; k++) {
                        if (i + j + k == x) {
                            count++;
                        }
                    } int k = j + 1; int k = j + 1; k j + 1 j 1 k <= n k n k++ k++ k {
                        if (i + j + k == x) {
                            count++;
                        }
                    } {
                        if (i + j + k == x) {
                            count++;
                        }
                    } if (i + j + k == x) {
                            count++;
                        } i + j + k == x i + j + k i + j + k i j k x {
                            count++;
                        } count++ count System.out.println(count) System.out.println System.out System System.out count String[] args args public class Main {

    /**
     * @param args the command line arguments
     */
    static char[] xx = new char[]{'S', 'H', 'C', 'D'};

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        while (true) {
            int n = sc.nextInt();
            int x = sc.nextInt();
            if (n == 0 && x == 0) {
                break;
            }
            int count = 0;
            for (int i = 1; i <= n; i++) {
                for (int j = i + 1; j <= n; j++) {
                    for (int k = j + 1; k <= n; k++) {
                        if (i + j + k == x) {
                            count++;
                        }
                    }
                }
            }
            System.out.println(count);
        }

    }

} public class Main {

    /**
     * @param args the command line arguments
     */
    static char[] xx = new char[]{'S', 'H', 'C', 'D'};

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        while (true) {
            int n = sc.nextInt();
            int x = sc.nextInt();
            if (n == 0 && x == 0) {
                break;
            }
            int count = 0;
            for (int i = 1; i <= n; i++) {
                for (int j = i + 1; j <= n; j++) {
                    for (int k = j + 1; k <= n; k++) {
                        if (i + j + k == x) {
                            count++;
                        }
                    }
                }
            }
            System.out.println(count);
        }

    }

} Main
import java.util.Scanner;

/**
 *
 * @author k16075kk
 */
public class Main {

    /**
     * @param args the command line arguments
     */
    static char[] xx = new char[]{'S', 'H', 'C', 'D'};

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        while (true) {
            int n = sc.nextInt();
            int x = sc.nextInt();
            if (n == 0 && x == 0) {
                break;
            }
            int count = 0;
            for (int i = 1; i <= n; i++) {
                for (int j = i + 1; j <= n; j++) {
                    for (int k = j + 1; k <= n; k++) {
                        if (i + j + k == x) {
                            count++;
                        }
                    }
                }
            }
            System.out.println(count);
        }

    }

}

