#include <bits/stdc++.h>
using namespace std;
#define INF 1000000000000000000
#define MOD 998244353
using ll=long long;
using Graph=vector<vector<int>>;

int main(){
  int N,M;
  cin>>N>>M;
  vector<ll> dp(M+1,0);
  if(N==1){
    cout<<1<<endl;
    return 0;
  }
  dp[0]=1;
  for(int i=0;i<M;i++){
    dp[i+1]+=dp[i];
    dp[i+1]%=MOD;
    if(i+N<=M){
      dp[i+N]+=dp[i];
      dp[i+N]%=MOD;
    }
  }
  cout<<dp[M]<<endl;
}