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 cnt=0;
    sc.close();
    for(int i=Math.max(0,s-2*k);i<=Math.min(k,s);i++){
      for(int j=Math.max(0,s-i-k);j<=Math.min(k,s-i);j++){
        int tmp=s-i-j;
        if(tmp>=0&&tmp<=k){
          cnt++;
        }
      }
    }
    System.out.println(cnt);
  }
}
/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