#include <stdio.h>
#define DIM 2*661

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

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