#include <fstream>
#include <iostream>
#include <stdlib.h>
using namespace std;

ifstream fi("1-sir.in");
ofstream fo("1-sir.out");

long d[260][33000],n,s;

int main()
{

    fi >> n >> s;
    d[1][0] = 1;

    for (int i=2; i<=n; i++) {
        for (int j=0; j<=n*(n-1)/2; j++) {
            d[i][j] = d[i-1][abs(j-(i-1))] + d[i-1][j+(i-1)];
        }
    }

    fo << d[n][abs(s)];

    return 0;
}