#include <fstream.h>
long n,s,d[5][256/2*255],i,oth=1,j;

inline long abs(long a)
  { if (a<0) return -a;
    return a;
  }

int main()
{
ifstream fin("1-sir.in");
ofstream fout("1-sir.out");
fin>>n>>s;
if (s<0)
s*=-1;
d[0][0]=1;
for (i=1;i<=n;i++)
  {
     for (j=0;j<=s;j++)
	d[i][j]=d[1-oth][abs(j-(i-1))]+d[1-oth][abs(j+(i-1))];
     oth*=-1;
  }
fout<<d[n][s]<<'\n';
return 0;
}