#include<bits/stdc++.h>
#include<iostream>
using namespace std;
using LL = long long;
using P = pair<int,int>;
using Graph = vector<vector<int>>;
const int INF = 1 << 29;
const long long LINF = 1LL << 60;
#define all(x) (x).begin(), (x).end()
#define rep(i,n) for(int i = 0; i < (n); ++i)
template<class T>void chmin(T&a, T b){if(a > b) a = b;}
template<class T>void chmax(T&a, T b){if(a < b) a = b;}


int main(){
	long long N, W; cin >> N >> W;
	vector<long long> dp(W+1, 0);
	dp[0] = 1;
	for(int i = 1; i <= W; ++i){
		dp[i] += dp[i-1];
		if(i-N>=0&&N!=1) dp[i] += dp[i-N];
		dp[i] %= 998244353;
	}

//	for(auto v : dp) cout << v << endl;
	cout << dp[W] << endl;

}