#include <bits/stdc++.h>
using namespace std;
const int MOD = 998244353;
long A[1<<20], B[1<<20];
long solve(long N, long M) {
	if(B[M]) return A[M];
	if(N > M) return 1;
	B[M]=1;
	long t = solve(N, M - N) + solve(N, M - 1);
	return A[M]=t % MOD;
}
long N, M;
int main() {
	cin >> N >> M;
	if (N == 1) {
		cout << 1 << "\n";
		return 0;
	}
	cout << solve(N, M) << "\n";
}