package com.my;

import java.util.LinkedList;
import java.util.Scanner;

public class AAA {
    private static LinkedList<Integer> list = new LinkedList<Integer>(); 
    static int c = 0; 
    static void myPrint() {
     c++;
    }
    
    public static void findSum(int sum, int n) {
        if (n >= 0 && sum == 0) {
            myPrint(); 
            return;
        }
        if (n >= 1 && sum == 1) { 
        list.push(1);
        myPrint();
        list.pop();
        return;
        }
        if (n == 1 && sum > 1)
            return;
        if (sum >= n) {
            list.push(n); 
            findSum(sum - n, n - 1); 
            list.pop(); 
            findSum(sum, n - 1);
        } else {
            findSum(sum, sum);
        } 
        return;
    }
    
    public static void main(String[] args) { 
        Scanner in = new Scanner(System.in); 
        int n = in.nextInt();
        int m = in.nextInt();
        findSum(m, n);
        System.out.println(c);
    }