#include <stdio.h>
#include <math.h>
#define DIM 2*65600

int A[DIM], B[DIM],i,k,s,n;

int main(){
  FILE *f = fopen("1sir.in","r");
  fscanf(f,"%d %d", &n,&s);
  fclose(f);
  FILE *g = fopen("1sir.out","w");
  if (abs(s)>n*(n-1)/2){
	fprintf(g,"%d",0);
	fclose(g);
	return 0;
  }
  A[1] = 1;
  A[0] = 0;
  for (k=3;k<=n;k++) {
    for (i=0;i<=2*s;i++)
	  B[i] = A[abs(i-(k-1))] + A[abs(i+k-1)];
	for (i=0;i<=2*s;i++)
	  A[i] = B[i];
  }
  fprintf(g,"%d",A[s]);
  fclose(g);
  return 0;
}