import java.util.*;

public class Main{
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
            int K = sc.nextInt();
            int S = sc.nextInt();
            int K2 = K * 2;

            int count = 0;
            for(int X = 0;X <= K;X++){
                if(K2 + X >= S){
                    for(int Y = 0;Y <= K;Y++){
                        int sxy = S - X -Y;
                        
                        if(0 <= sxy && sxy <= K){
                            //System.out.println("X"+X+"Y"+Y+"sxy"+sxy);
                            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