import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {
	
	public static void main(String[] args) {
		try {
			BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
			
			for (;;) {
				String input = reader.readLine();
				String[] array = input.split(" ");
				int n = Integer.parseInt(array[0]);
				int x = Integer.parseInt(array[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);
			}
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

} import java.io.BufferedReader; BufferedReader java.io import java.io.IOException; IOException java.io import java.io.InputStreamReader; InputStreamReader java.io public class Main {
	
	public static void main(String[] args) {
		try {
			BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
			
			for (;;) {
				String input = reader.readLine();
				String[] array = input.split(" ");
				int n = Integer.parseInt(array[0]);
				int x = Integer.parseInt(array[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);
			}
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

} Main public static void main(String[] args) {
		try {
			BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
			
			for (;;) {
				String input = reader.readLine();
				String[] array = input.split(" ");
				int n = Integer.parseInt(array[0]);
				int x = Integer.parseInt(array[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);
			}
		} catch (IOException e) {
			e.printStackTrace();
		}
	} main {
		try {
			BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
			
			for (;;) {
				String input = reader.readLine();
				String[] array = input.split(" ");
				int n = Integer.parseInt(array[0]);
				int x = Integer.parseInt(array[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);
			}
		} catch (IOException e) {
			e.printStackTrace();
		}
	} try {
			BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
			
			for (;;) {
				String input = reader.readLine();
				String[] array = input.split(" ");
				int n = Integer.parseInt(array[0]);
				int x = Integer.parseInt(array[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);
			}
		} catch (IOException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} IOException e {
			e.printStackTrace();
		} e.printStackTrace() e.printStackTrace e {
			BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
			
			for (;;) {
				String input = reader.readLine();
				String[] array = input.split(" ");
				int n = Integer.parseInt(array[0]);
				int x = Integer.parseInt(array[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);
			}
		} BufferedReader reader = new BufferedReader(new InputStreamReader(System.in)); reader new BufferedReader(new InputStreamReader(System.in)) for (;;) {
				String input = reader.readLine();
				String[] array = input.split(" ");
				int n = Integer.parseInt(array[0]);
				int x = Integer.parseInt(array[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 input = reader.readLine();
				String[] array = input.split(" ");
				int n = Integer.parseInt(array[0]);
				int x = Integer.parseInt(array[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 input = reader.readLine();
				String[] array = input.split(" ");
				int n = Integer.parseInt(array[0]);
				int x = Integer.parseInt(array[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 input = reader.readLine(); input reader.readLine() reader.readLine reader String[] array = input.split(" "); array input.split(" ") input.split input " " int n = Integer.parseInt(array[0]); n Integer.parseInt(array[0]) Integer.parseInt Integer array[0] array 0 int x = Integer.parseInt(array[1]); x Integer.parseInt(array[1]) Integer.parseInt Integer array[1] array 1 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 - 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++ 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) {
		try {
			BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
			
			for (;;) {
				String input = reader.readLine();
				String[] array = input.split(" ");
				int n = Integer.parseInt(array[0]);
				int x = Integer.parseInt(array[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);
			}
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

} public class Main {
	
	public static void main(String[] args) {
		try {
			BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
			
			for (;;) {
				String input = reader.readLine();
				String[] array = input.split(" ");
				int n = Integer.parseInt(array[0]);
				int x = Integer.parseInt(array[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);
			}
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

} Main
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {
	
	public static void main(String[] args) {
		try {
			BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
			
			for (;;) {
				String input = reader.readLine();
				String[] array = input.split(" ");
				int n = Integer.parseInt(array[0]);
				int x = Integer.parseInt(array[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);
			}
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

}