#include <bits/stdc++.h>
#define ll long long
#pragma GCC optimize("O3")
#define pb push_back
using namespace std;

signed main(){
    ifstream cin ("1-sir.in");
    ofstream cout ("1-sir.out");
    int n, k;cin >> n >> k;
    vector <int> dp(33000,0);
    dp[0]=1;
    for(int i=1;i < n;i++){
        for(int j=32895;j - ((n - i) * 2) >= 0;j--){
            dp[j]+=dp[j - ((n - i) * 2)];
        }
    }
    if(abs(k) < 32896)cout << dp[k + n * ( n - 1LL) / 2];
     else cout << "0";
    
    return 0;
}