Problem:
How many ways?

Write a program which identifies the number of combinations of three integers which satisfy the following conditions:

You should select three distinct integers from 1 to n.

A total sum of the three integers is x.

For example, there are two combinations for n = 5 and x = 9.

1 + 3 + 5 = 9

2 + 3 + 4 = 9

Input

The input consists of multiple datasets. For each dataset, two integers n and x are given in a line.

The input ends with two zeros for n and x respectively. Your program should not process for these terminal symbols.

Constraints

3 ≤ n ≤ 100

0 ≤ x ≤ 300

Output

For each dataset, print the number of combinations in a line.

Sample Input

5 9
0 0

Sample Output

2

Note

      解説

Solution in JAVA (judge verdict: Time Limit Exceeded)

import java.util.*;
import java.io.*;
 
 
public class Main{
 public static void  main(String[] args)throws IOException{
  BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
  String str = br.readLine();
                     
                    while(str !=null){
                        String[] temp = str.split("\\s");
                        int Enum = Integer.parseInt(temp[0]);
                        int target = Integer.parseInt(temp[1]);
 
                        if(Enum ==0 && target ==0){
                            break;
                        }
                         
                        int count =0;
                        for(int i =1;i<=Enum-2;i++){
                            for(int j=i+1;j<=Enum-1;j++){
                                for(int k=j+1;k<=Enum;k++){
                                    int total = 0;
                                    total = i + j + k;
                                    if(total == target){
                                        count++;
                                    }
                                }
                            }                    
                        }
                        System.out.println(count);
 
                    } 
 }
}