#include <iostream>
#include <vector>
using namespace std;

const long long MOD = 998244353;

template <int mod>
struct Combination {
  long long n_max;
  vector<long long> fac, inv, finv;
  Combination(int n):n_max(n), fac(n+1,1), inv(n+1,1), finv(n+1,1){
    for(int i = 2; n > i; i++){
      fac[i] = (fac[i-1]*i)%mod;
      inv[i] = mod-((inv[mod%i]*(mod/i))%mod);
      finv[i] = (finv[i-1]*inv[i])%mod;
    }
  }

  long long C(int n, int r){
    if(n < r)return 0;
    if(max(n,r) > n_max)return 0;
    return (((fac[n]*finv[r])%mod)*finv[n-r])%mod;
  }
};
using comb = Combination<MOD>;

int main(){
  int n,m;cin>>n>>m;
  if(n > m)cout << 1 << endl;
  else{
    int x = m/n;
    comb c(m);
    long long ans = 0;
    for(int i = 0; x >= i; i++){
      ans = (ans+c.C(m-(i*(n-1)), i))%MOD;
    }
    cout << ans << endl;
  }
}