import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		final Scanner sc = new Scanner(System.in);
		int k = sc.nextInt();
		int want = sc.nextInt();
		int count = 0;
		for(int i = 0; i <= k; i++) {
			for(int m = 0; m <= k; m++) {
				if(want - i - m <= k && want - i - m >= 0) {
					count++;
				}
			}
		}
		System.out.println(count);
	}
}
/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