import java.io.*;

public class Main {
  public static void main(String[] args) throws IOException {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    
    String[] data = br.readLine().split(" ");
    
    long k = Long.parseLong(data[0]);
    long s = Long.parseLong(data[1]);
  
    long result = 0;
    
    for (int i=0; i<=k; i++){
      result += getNumAllocation(s-i, k);
    }
    
    System.out.println(result);
  }
  public static long getNumAllocation(long sum, long max){
    if (sum < 0){
      return 0;
    } else if (sum <= max){
      return sum+1;
    } else if (sum <= max*2){
      return 2*max-sum+1;
    } else {
      return 0;
    }
  }
}

/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