import java.util.*;

public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
        int num = sc.nextInt();
        int sum = sc.nextInt();
        
        int cnt = 0;
        
        for(int x = 0; x<=num; x++){
            for(int y = 0; y<=num; y++){
                if((sum - (x+y) <= num) && (sum - (x+y) >= 0)){
                    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