#include <bits/stdc++.h>
#define DIM 260*260
using namespace std;
ifstream fin("1-sir.in");
ofstream fout("1-sir.out");
int n,s,i,j,smax,t,d[2][DIM];
int main() {
    fin>>n>>s;
    smax=n*(n-1)/2;
    s=abs(s);
    if (s>smax) {
        fout<<"0";
        return 0;
    }
    //d[i][j]=cate 1-siruri cu suma j si i termeni
    //tinem doar 2 linii
    d[0][0]=1;
    for (i=1;i<=n;i++) {
        t=1-t;
        for (j=0;j<=s;j++) {
            if (abs(j-(i-1))!=j+(i-1))
                d[t][j]=d[1-t][abs(j-(i-1))]+d[1-t][j+(i-1)];
            else
                d[t][j]=d[1-t][j+(i-1)];
        }
    }
    fout<<d[n&1][s];
    return 0;
}