#include <iostream>


using namespace std;

const long long mod = 998244353;

long long fac[2000000];
long long inv[2000000];
long long finv[2000000];
void init(int n){
  fac[0] = fac[1] = 1;
  inv[1] = 1;
  finv[0] = finv[1] = 1;
  for(long long i = 2; n >= i; i++){
    fac[i] = (i*fac[i-1])%mod;
    inv[i] = ((mod-inv[mod%i]) * (mod/i))%mod;
    finv[i] = (finv[i-1]*inv[i])%mod;
  }
}


int main(){
  long long n,m;cin>>n>>m;
  init(m);
  long long ans = fac[m];
  for(int i = 0; n > i; i++){
    long long nw = m/n+((m%n)>i);
    ans = (ans*finv[nw])%mod;
  }
  cout << ans << endl;
}