#include<iostream>
using namespace std;
const long mod=998244353;
long dp[1<<20];
long N,M;
main()
{
	cin>>N>>M;
	if(N==1)
	{
		cout<<1<<endl;
		return 0;
	}
	dp[0]=1;
	for(int i=0;i<M;i++)
	{
		if(i+N<=M)(dp[i+N]+=dp[i])%=mod;
		(dp[i+1]+=dp[i])%=mod;
	}
	cout<<dp[M]<<endl;
}