#include <bits/stdc++.h>
using namespace std;
using i64 = int64_t;
constexpr i64 mod = 998244353;
i64 power(i64 a, i64 r) {
    i64 res = 1;
    for (; r; r >>= 1, a = a * a % mod) {
        if (r & 1) {
            res = res * a % mod;
        }
    }
    return res;
}
int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    i64 n, p;
    cin >> n >> p;
    vector<i64> f(n + 1, 1), g(n + 1, 1);
    for (i64 i = 1; i <= n; i += 1) {
        g[i] = power(f[i] = f[i - 1] * i % mod, mod - 2);
    }
    i64 ans = f[n];
    for (i64 i = 0; i * p <= n; i += 1) {
        i64 pans = f[n];
        pans = pans * g[n - i * p] % mod;
        pans = pans * power(power(p, mod - 2), i) % mod;
        pans = pans * g[i] % mod;
        // cerr << i << " " << pans << "\n";
        ans = (ans + mod - pans) % mod;
    }
    cout << ans;
}