ll N,K;
mint d[301][44851],t,x;
{
	rd(N,K);
	d[1][0]=1;
	for(ll i=2;i<=N;++i){
		for(ll j=t=0;j<=i*(i-1)/2;++j){
			t+=d[i-1][j];
			if(j>=i)t-=d[i-1][j-i];
			d[i][j]=t;
		}
	}
	x+=d[N][0..K];
	wt(x);
}