import java.io.IOException;
import java.util.Scanner;
 
public class Main {
 
    public static void main(String[] args) throws IOException {
        Scanner sc = new Scanner(System.in);
       
        while (true) {
            String[] data = sc.nextLine().split(" ");
            int n = Integer.parseInt(data[0]);
            int x = Integer.parseInt(data[1]);
            if (n == 0 && x == 0)
                break;
            int count = 0;
            for (int i = 1; i <= n - 2; i++) {
                for (int j = i + 1; j <= n - 1; j++) {
                    for (int k = j + 1; k <= n; k++) {
                        if ((i + j + k) == x)
                            count++;
                    }
                }
            }
            System.out.println(count);
 
        }
    }
 
} import java.io.IOException; IOException java.io import java.util.Scanner; Scanner java.util public class Main {
 
    public static void main(String[] args) throws IOException {
        Scanner sc = new Scanner(System.in);
       
        while (true) {
            String[] data = sc.nextLine().split(" ");
            int n = Integer.parseInt(data[0]);
            int x = Integer.parseInt(data[1]);
            if (n == 0 && x == 0)
                break;
            int count = 0;
            for (int i = 1; i <= n - 2; i++) {
                for (int j = i + 1; j <= n - 1; j++) {
                    for (int k = j + 1; k <= n; k++) {
                        if ((i + j + k) == x)
                            count++;
                    }
                }
            }
            System.out.println(count);
 
        }
    }
 
} Main public static void main(String[] args) throws IOException {
        Scanner sc = new Scanner(System.in);
       
        while (true) {
            String[] data = sc.nextLine().split(" ");
            int n = Integer.parseInt(data[0]);
            int x = Integer.parseInt(data[1]);
            if (n == 0 && x == 0)
                break;
            int count = 0;
            for (int i = 1; i <= n - 2; i++) {
                for (int j = i + 1; j <= n - 1; 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) {
            String[] data = sc.nextLine().split(" ");
            int n = Integer.parseInt(data[0]);
            int x = Integer.parseInt(data[1]);
            if (n == 0 && x == 0)
                break;
            int count = 0;
            for (int i = 1; i <= n - 2; i++) {
                for (int j = i + 1; j <= n - 1; 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) {
            String[] data = sc.nextLine().split(" ");
            int n = Integer.parseInt(data[0]);
            int x = Integer.parseInt(data[1]);
            if (n == 0 && x == 0)
                break;
            int count = 0;
            for (int i = 1; i <= n - 2; i++) {
                for (int j = i + 1; j <= n - 1; j++) {
                    for (int k = j + 1; k <= n; k++) {
                        if ((i + j + k) == x)
                            count++;
                    }
                }
            }
            System.out.println(count);
 
        } true {
            String[] data = sc.nextLine().split(" ");
            int n = Integer.parseInt(data[0]);
            int x = Integer.parseInt(data[1]);
            if (n == 0 && x == 0)
                break;
            int count = 0;
            for (int i = 1; i <= n - 2; i++) {
                for (int j = i + 1; j <= n - 1; j++) {
                    for (int k = j + 1; k <= n; k++) {
                        if ((i + j + k) == x)
                            count++;
                    }
                }
            }
            System.out.println(count);
 
        } String[] data = sc.nextLine().split(" "); data sc.nextLine().split(" ") sc.nextLine().split sc.nextLine() sc.nextLine sc " " int n = Integer.parseInt(data[0]); n Integer.parseInt(data[0]) Integer.parseInt Integer data[0] data 0 int x = Integer.parseInt(data[1]); x Integer.parseInt(data[1]) Integer.parseInt Integer data[1] data 1 if (n == 0 && x == 0)
                break; n == 0 && x == 0 n == 0 n 0 x == 0 x 0 break; int count = 0; count 0 for (int i = 1; i <= n - 2; i++) {
                for (int j = i + 1; j <= n - 1; 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 - 2 i n - 2 n 2 i++ i++ i {
                for (int j = i + 1; j <= n - 1; j++) {
                    for (int k = j + 1; k <= n; k++) {
                        if ((i + j + k) == x)
                            count++;
                    }
                }
            } {
                for (int j = i + 1; j <= n - 1; j++) {
                    for (int k = j + 1; k <= n; k++) {
                        if ((i + j + k) == x)
                            count++;
                    }
                }
            } for (int j = i + 1; j <= n - 1; 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 - 1 j n - 1 n 1 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 System.out.println(count) System.out.println System.out System System.out count String[] args args public class Main {
 
    public static void main(String[] args) throws IOException {
        Scanner sc = new Scanner(System.in);
       
        while (true) {
            String[] data = sc.nextLine().split(" ");
            int n = Integer.parseInt(data[0]);
            int x = Integer.parseInt(data[1]);
            if (n == 0 && x == 0)
                break;
            int count = 0;
            for (int i = 1; i <= n - 2; i++) {
                for (int j = i + 1; j <= n - 1; j++) {
                    for (int k = j + 1; k <= n; k++) {
                        if ((i + j + k) == x)
                            count++;
                    }
                }
            }
            System.out.println(count);
 
        }
    }
 
} public class Main {
 
    public static void main(String[] args) throws IOException {
        Scanner sc = new Scanner(System.in);
       
        while (true) {
            String[] data = sc.nextLine().split(" ");
            int n = Integer.parseInt(data[0]);
            int x = Integer.parseInt(data[1]);
            if (n == 0 && x == 0)
                break;
            int count = 0;
            for (int i = 1; i <= n - 2; i++) {
                for (int j = i + 1; j <= n - 1; j++) {
                    for (int k = j + 1; k <= n; k++) {
                        if ((i + j + k) == x)
                            count++;
                    }
                }
            }
            System.out.println(count);
 
        }
    }
 
} Main
import java.io.IOException;
import java.util.Scanner;
 
public class Main {
 
    public static void main(String[] args) throws IOException {
        Scanner sc = new Scanner(System.in);
       
        while (true) {
            String[] data = sc.nextLine().split(" ");
            int n = Integer.parseInt(data[0]);
            int x = Integer.parseInt(data[1]);
            if (n == 0 && x == 0)
                break;
            int count = 0;
            for (int i = 1; i <= n - 2; i++) {
                for (int j = i + 1; j <= n - 1; j++) {
                    for (int k = j + 1; k <= n; k++) {
                        if ((i + j + k) == x)
                            count++;
                    }
                }
            }
            System.out.println(count);
 
        }
    }
 
}