


import java.util.Scanner;

class Main{
	public static void main(String[] args) {
		Scanner sc=new Scanner(System.in);
		int K=sc.nextInt();
		int S=sc.nextInt();
		long toori=0;

		if(K<=200) {
			for(int i=0; i<=K; i++) {
				for(int j=0; j<=K; j++) {
					for(int k=0; k<=K; k++) {
						if(i+j+k==S) {
							toori++;
						}
					}
				}
			}
			System.out.println(toori);
		}
		else {
			if(S<=K) {
				System.out.println((S+2)*(S+1)/2);
			}
			else if(S>K && S<=2*K) {
				System.out.println((S+2)*(S+1)/2-3*(S-K+1)*(S-K)/2);

			}
			else if(S>2*K) {
				int tmp=3*K-S;
				System.out.println((tmp+2)*(tmp+1)/2);
			}
		}

	}
}
/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