import java.util.Scanner;
import javax.sound.midi.SysexMessage;
  
public class Main{      
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        for(int l = 0;l<100;l++){
            String str = sc.nextLine();
            String str2[] = str.split(" ");
            int n = Integer.parseInt(str2[0]);
            int x = Integer.parseInt(str2[1]);
            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 import javax.sound.midi.SysexMessage; SysexMessage javax.sound.midi public class Main{      
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        for(int l = 0;l<100;l++){
            String str = sc.nextLine();
            String str2[] = str.split(" ");
            int n = Integer.parseInt(str2[0]);
            int x = Integer.parseInt(str2[1]);
            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 public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        for(int l = 0;l<100;l++){
            String str = sc.nextLine();
            String str2[] = str.split(" ");
            int n = Integer.parseInt(str2[0]);
            int x = Integer.parseInt(str2[1]);
            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);
        for(int l = 0;l<100;l++){
            String str = sc.nextLine();
            String str2[] = str.split(" ");
            int n = Integer.parseInt(str2[0]);
            int x = Integer.parseInt(str2[1]);
            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) for(int l = 0;l<100;l++){
            String str = sc.nextLine();
            String str2[] = str.split(" ");
            int n = Integer.parseInt(str2[0]);
            int x = Integer.parseInt(str2[1]);
            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 l = 0; int l = 0; l 0 l<100 l 100 l++ l++ l {
            String str = sc.nextLine();
            String str2[] = str.split(" ");
            int n = Integer.parseInt(str2[0]);
            int x = Integer.parseInt(str2[1]);
            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);
        } {
            String str = sc.nextLine();
            String str2[] = str.split(" ");
            int n = Integer.parseInt(str2[0]);
            int x = Integer.parseInt(str2[1]);
            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);
        } String str = sc.nextLine(); str sc.nextLine() sc.nextLine sc String str2[] = str.split(" "); str2 str.split(" ") str.split str " " int n = Integer.parseInt(str2[0]); n Integer.parseInt(str2[0]) Integer.parseInt Integer str2[0] str2 0 int x = Integer.parseInt(str2[1]); x Integer.parseInt(str2[1]) Integer.parseInt Integer str2[1] str2 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;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 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){
        Scanner sc = new Scanner(System.in);
        for(int l = 0;l<100;l++){
            String str = sc.nextLine();
            String str2[] = str.split(" ");
            int n = Integer.parseInt(str2[0]);
            int x = Integer.parseInt(str2[1]);
            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{      
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        for(int l = 0;l<100;l++){
            String str = sc.nextLine();
            String str2[] = str.split(" ");
            int n = Integer.parseInt(str2[0]);
            int x = Integer.parseInt(str2[1]);
            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;
import javax.sound.midi.SysexMessage;
  
public class Main{      
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        for(int l = 0;l<100;l++){
            String str = sc.nextLine();
            String str2[] = str.split(" ");
            int n = Integer.parseInt(str2[0]);
            int x = Integer.parseInt(str2[1]);
            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);
        }
    }   
}              

    
