import java.util.*;

public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		
		Scanner s=new Scanner(System.in);
		int K=s.nextInt();
		int S=s.nextInt();
		int count=0;
		int i=0,j=0;
		
		for(i=0;i<=K;i++){
			for(j=0;j<=K;j++){
				if(S-i-j<=K&&S-i-j>=0)count++;
			}
		}
		
		System.out.print(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