#include <bits/stdc++.h>
using namespace std;

int main() {
  int N, M;
  cin >> N >> M;
  if (N == 1) return cout << 1 << "\n", 0;
  vector<long> DP(M, 1);
  for (int i = N - 1; i < M; i++) {
    (DP.at(i) = ((i - 1 < 0) ? 1 : DP.at(i - 1)) + ((i - N < 0) ? 1 : DP.at(i - N))) %= 998244353;
  }
  cout << DP.at(M - 1) << "\n";
}