
import java.util.Scanner;

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

import java.util.Scanner;

public class Main {
    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 s = 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) s++;
                }
            }
        }
        System.out.println(s);
        }
    }
}
