#include <atcoder/modint>
#include <cmath>
#include <iostream>
using namespace std;

using mint = atcoder::modint998244353;
using i64 = long long;

mint fact[1000010];
mint ifact[1000010];

mint binom(int n, int r) {
    if (n < 0 || r < 0 || n < r) return 0;
    return fact[n] * ifact[r] * ifact[n - r];
}

void solve() {
    int n, k;
    cin >> n >> k;
    if (k == 0) {
        cout << 1 << "\n";
        return;
    }
    mint invk = mint(k).inv();
    mint ans = 0;
    for (int p = 1; p <= k; p += 2) {
        int l = (p + 1) / 2;
        mint tmp = binom(2 * k + n - p, n - p);
        tmp *= binom(k, l) * binom(k, l - 1) * invk;
        ans += tmp;
    }
    cout << ans.val() << "\n";
}

int main() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    int t;
    // cin >> t;
    t = 1;
    fact[0] = 1;
    for (int i = 1; i <= 1000000; i++) {
        fact[i] = fact[i - 1] * i;
    }
    ifact[1000000] = fact[1000000].inv();
    for (int i = 1000000; i > 0; i--) {
        ifact[i - 1] = ifact[i] * i;
    }
    while (t--) solve();
}