import java.util.*;
public class Main {
	public static void main(String args[]){
		Scanner sc = new Scanner(System.in);
		long K = sc.nextInt();
		long S = sc.nextInt();
		long res = 0;
		for(long i = Math.min(K, S); i>=0; i--){
			long v = S-i;
			if(v < K )res+=(v+1);
			else if(v == K) res+=(K+1);
			else if(v <= 2*K){
				long a = v-K;
				res+=K-a+1;
			}
		}
		System.out.println(res);
	}
}
/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