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();
        sc.close();

        int count = 0;
        for(int x=0; x<=k; x++) {
            for(int y=0; y<=k; y++) {
                if(s-(x+y) >= 0 && s-(x+y) <= k) {
                    if(x+y+(s-(x+y)) == s) {
                        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