import java.util.Scanner;

public class Main {

	public static void main(String[] args) {


		Scanner sc = new Scanner(System.in);
		int k = sc.nextInt();
		int s = sc.nextInt();
		int answer = 0;
		for(int x = 0;x <= k;x++) {
			if(x > s) {
				break;
			}
			for(int y = 0;y <= k;y++) {
				if(x + y > s) {
					break;
				}else {
					if(x + y + k >= s) {
						answer++;
					}
				}
			}
		}
		System.out.println(answer);
	}
}
/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