import java.io.IOException;
import java.io.BufferedReader;
import java.io.InputStreamReader;
class Main {
	public static void main(String[] args) throws IOException {
		int count = 0;		//?§£????????°
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String line = br.readLine();
        while( !(line.equals("0 0")) ) {
			String nums[] = line.split(" ");
			int max = Integer.parseInt(nums[0]);
			int sum = Integer.parseInt(nums[1]);
			for( int i = 1 ; i <= max ; i++ ) {		//??????????????°???
				for( int j = i+1 ; j <= max ; j++ ) {	//??????????????°???
					int k = sum - i - j ;
					if ( k <= j ) {	//??????????????°??????j????????§??????????????????
						break;	//	??\??????j?????¨??¨??????
					}
					if ( k > max ) {	//??????????????°??????max????????§??????????????????
						continue; //??\??????j???????????§?????????
					}
					count++;
//					System.out.println( i + " " + j + " " + k ) ;
				}
			}
			System.out.println(count);
			line = br.readLine();
			count = 0;
		}
	}
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz