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();
        int count = 0;
 
        for (int x = 0; x <= K; x++) {
            for (int y = 0; y <= K; y++) {
                int z = S - x - y;
                if (z >= 0 && z <= K) {
                    count++;
                }
            }
        }
 
        System.out.println(count);
        sc.close();
    }
}
 

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