#include <bits/stdc++.h>

using namespace std;
ifstream in("1-sir.in");
ofstream out("1-sir.out");
int d[2][35000];
int main()
{
    int n,s;
    in >> n >> s;
    if(n*(n-1)/2<s)
    {
        out << 0;
        return 0;
    }
    d[1][0]=1;
    for(int i=2; i<=n; i++)
    {
        for(int j=0; j<=i*(i-1)/2; j++)
        {
            d[i%2][j]=d[(i-1)%2][abs(j-(i-1))]+d[(i-1)%2][j+i-1];
        }
    }
    out << d[n%2][abs(s)];
    return 0;
}