import java.util.*;
 
public class Main{
  public static void main(String[]args){
    Scanner sc =  new Scanner(System.in);
    String[] T = sc.nextLine().split(" ");
    int K = Integer.parseInt(T[0]);
    int S = Integer.parseInt(T[1]);
    
    int ans = 0;
    for(int i = 0; i <= K; i++){
      for(int j = 0; j <= K; j++){
        int k = S-i-j;
        if(i+j+k == S && k >= 0 && k <= K){
          ans++;
        }
      }
    }
    System.out.println(ans);
  }
}
/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