import java.util.Scanner;

public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		int max = sc.nextInt();
		int answer = sc.nextInt();
		int count=0;
		for(int a=0;a<=max;a++){
			for(int b=0;b<=max;b++){ 
				if(answer-a-b<=max && answer-a-b>=0) count++;
			}
		}
		System.out.println(count);;
		
		sc.close();
	}
}
/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