#include <bits/stdc++.h>

constexpr int MOD = 998244353;
using i64 = int64_t;

int qpow(int a, int b) {
    int res = 1;
    while (b) {
        if (b & 1) {
            res = (i64)res * a % MOD;
        }
        a = (i64)a * a % MOD, b >>= 1;
    }
    return res;
}

int main() {
    int n, k;
    std::cin >> n >> k;

    std::vector<int> fact(n + 1), ifact(n + 1);
    fact[0] = 1;
    for (int i = 1; i <= n; ++i) {
        fact[i] = (i64)fact[i - 1] * i % MOD;
    }
    ifact[n] = qpow(fact[n], MOD - 2);
    for (int i = n - 1; i >= 0; --i) {
        ifact[i] = (i64)ifact[i + 1] * (i + 1) % MOD;
    }

    std::vector<int> f(n + 1), s(n + 1);
    f[0] = 1, s[0] = 1;
    f[1] = 1, s[1] = 2;
    for (int i = 2; i <= n; ++i) {
        int p = s[i - 1];
        if (i - 1 - k >= 0) {
            p = (p - s[i - 1 - k]) % MOD;
        }
        f[i] = (i64)p * fact[i - 1] % MOD;
        s[i] = (s[i - 1] + (i64)f[i] * ifact[i]) % MOD;
        // std::cout << f[i] << ' ' << s[i] << '\n';
    }

    std::cout << (f[n] + MOD) % MOD << '\n';
}