#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < (n); ++i)
#define srep(i,s,t) for(int i = s; i < t; ++i)
#define drep(i,n) for(int i = (n)-1; i >= 0; --i)
using namespace std;
typedef long long int ll;
typedef pair<int,int> P;
#define yn {puts("Yes");}else{puts("No");}
#define MAX_N 200005

int main() {
    ll n, m;
    cin >> n >> m;
    ll dp[m+1] = {};
    dp[0] = 1;
    ll MOD = 998244353;
    if(n == 1){
        cout << 1 << endl;
        return 0;
    }
    srep(i,1,m+1){
        dp[i] = dp[i-1];
        if(i-n>=0) dp[i] += dp[i-n];
        dp[i] %= MOD;
    }
    cout << dp[m] << endl;
    return 0;
}