#include <atcoder/modint>
#include <bits/stdc++.h>
using namespace std;

using mint = atcoder::modint998244353;
int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int n, p;
    cin >> n >> p;
    vector<mint> fact(n + 1, 1);
    for (int i = 2; i <= n; i++) {
        fact[i] = fact[i - 1] * i;
    }
    mint ans = 1;
    mint pat = 1;
    for (int i = 0; i < n / p; i++) {
        pat *= fact[n - i * p] / (fact[p] * fact[n - (i + 1) * p]);
        pat *= fact[p - 1];
        pat /= (i + 1);
        ans += pat;
    }
    ans = fact[n] - ans;
    cout << ans.val() << endl;
}