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

using Mint = atcoder::modint998244353;

int main()
{
	ios::sync_with_stdio(false);
	cin.tie(0);
	int N, P;
	cin >> N >> P;
	vector<Mint> F(N + 1), E(N + 1);
	F[0] = 1;
	for (int i = 1; i <= N; i++)
		F[i] = i * F[i - 1];

	E[0] = 1, E[1] = 1;
	for (int i = 2; i <= N; i++)
	{
		E[i] = E[i - 1];
		if (i >= P)
			E[i] += E[i - P] * F[i - 1] / F[i - P];
	}
	cout << (F[N] - E[N]).val() << endl;
}