import java.util.*;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		
		int k  =sc.nextInt(), s = sc.nextInt();
		
		int cnt = 0;
		for(int x=0;x<=k;x++){
			for(int y=0;y<=k;y++){
				if(x+y<=s && x+y+k>=s)
					cnt++;
			}
		}
		
		System.out.println(cnt);
	}

}

/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