#include<bits/stdc++.h>
using namespace std;
using ll =long long;
using vll =vector<ll>;
#define all(A) A.begin(),A.end()
#define rep(i, n) for (long long i = 0; i < (long long)(n); i++)

vector<ll> fact, factinv, inv;
ll mod = 998244353;
void prenCkModp(ll n) {
	fact.resize(n + 5);
	factinv.resize(n + 5);
	inv.resize(n + 5);
	fact.at(0) = fact.at(1) = 1;
	factinv.at(0) = factinv.at(1) = 1;
	inv.at(1) = 1;
	for (ll i = 2; i < n + 5; i++) {
		fact.at(i) = (fact.at(i - 1) * i) % mod;
		inv.at(i) = mod - (inv.at(mod % i) * (mod / i)) % mod;
		factinv.at(i) = (factinv.at(i - 1) * inv.at(i)) % mod;
	}

}
ll nCk(ll n, ll k) {
	if (n < k) return 0;
	return fact.at(n) * (factinv.at(k) * factinv.at(n - k) % mod) % mod;
}
int main(){
    ll N,M;
    cin>>N>>M;
    ll an=0;
    
    if(N==1||N>M){
        cout<<1<<endl;
        return 0;
    }
    prenCkModp(M+N+5);
    for(ll i=0;i<=M/N;i++){
        an+=(nCk(M-(N-1)*i,i));
        an%=mod;

    }
    cout<<an<<endl;
}