using namespace std;

#include <cstdio>
#include <string>

#define FIN "1-sir.in"
#define FOUT "1-sir.out"
#define NMAX 257
#define SMAX 257*128

int s1[SMAX], s2[SMAX], N, S;
const int prim = 194767;

int
 main ()
{
  int jj;
  
  freopen (FIN, "rt", stdin);
  freopen (FOUT, "wt", stdout);

  scanf ("%d%d", &N, &S);
  s1[0] = 1;
  for (int i = 2; i <= N; ++ i)
   {
     for (int j = 0; j <= N*(N-1)/2; ++ j)
      {
        jj = j - (i-1) > 0 ? j - (i-1) : -j + (i-1);
        s2[j] = s1[jj] + s1[j + (i-1)];
      }
     for (int j = 0; j <= N*(N-1)/2; ++ j)
       s1[j] = s2[j];
   }
  printf ("%d\n", s1[S]);
  return 0;
}