#include <bits/stdc++.h>
using namespace std;
using ll = long long;
ll const m = 998244353;
ll mpow(ll a, ll n) {
    ll ret = 1;
    while (n) {
        if (n & 1) {
            ret *= a;
            ret %= m;
        }
        a = (a * a) % m;
        n >>= 1;
    }
    return ret;
}
ll fct(ll a) {
    return (a ? a * fct(a - 1) : 1);
}
int main () {
    ll N, M;
    cin >> N >> M;
    ll ans = fct(M);
    ll q = M / N, r = M % N;
    ans *= mpow(fct(q + 1), m - 1 - r);
    ans %= m;
    ans *= mpow(fct(q), m - 1 - (N - r));
    ans %= m;
    cout << ans << endl;
}