#include <bits/stdc++.h>
using namespace std;
const long long MOD = 998244353;
int main(){
  int N, M;
  cin >> N >> M;
  vector<long long> dp(M + 1, 0);
  dp[0] = 1;
  for (int i = 1; i <= M; i++){
    dp[i] = dp[i - 1];
    if (i >= N && N > 1){
      dp[i] += dp[i - N];
      dp[i] %= MOD;
    }
  }
  cout << dp[M] << endl;
}