#include <fstream>

using namespace std;
ifstream cin("1-sir.in");
ofstream cout("1-sir.out");

int N,S, dp[260][33000],r,smic;

int main()
{
    cin>>N>>S;
    smic=N*(N-1)/2;
    r=(smic-S)/2;

    if(r<0|| (smic-S)%2!=0)
    {
        cout<<0<<'\n';
        return 0;
    }
    else if(r==0)
    {
        cout<<1<<'\n';
        return 0;
    }

    dp[0][0]=1;

    for(int k=1; k<N; ++k)
    {
        for(int s=0; s<=r; ++s)
                dp[k][s]=(dp[k-1][s]+dp[k-1][s-k]);
    }

    cout<<dp[N-1][r]<<'\n';
    return 0;
}