#include <vector>
#include <iostream>
using namespace std;
const int mod = 998244353;
int dp[1000009];
int main() {
	int N, M;
	cin >> N >> M;
	dp[0] = 1;
	int x = 0;
	for (int i = 1; i <= M; ++i) {
		dp[i] = dp[i - 1];
		if (i >= N) {
			dp[i] += dp[i - N];
			if (dp[i] >= mod) dp[i] -= mod;
		}
	}
	cout << dp[M] << endl;
	return 0;
}