#include <bits/stdc++.h>
using ll = long long;
#define int ll
const int N = 1e6 + 5;
const int MOD = 998244353;

std::vector<int> fac, inv;

int QSM (int x, int p) {
  int ans = 1;
  while (p) {
    if (p & 1) ans = 1ll * ans * x % MOD;
    p >>= 1, x = 1ll * x * x % MOD;
  }
  return ans;
}

void Prep() {
  fac = std::vector<int> (N, 1);
  inv = std::vector<int> (N, 1);
  for (int i = 1; i < N; ++i) fac[i] = 1ll * fac[i - 1] * i % MOD;
  inv[N - 1] = QSM(fac[N - 1], MOD - 2);
  for (int i = N - 2; i >= 1; --i) inv[i] = 1ll * inv[i + 1] * (i + 1) % MOD;
}

int C (int n, int m) {
  if (n < m) return 0;
  else return 1ll * fac[n] * inv[m] % MOD * inv[n - m] % MOD;
}

void charming() {
  int n, k; std::cin >> n >> k;
  int ans = 0;
  if (k & 1) {
    ans = 1ll * (n + 1) * QSM(2, MOD - 2) % MOD * QSM(n, k) % MOD;
    std::cout << ans << '\n';
    return;
  }
  int cnt = 0;
  for (int i = 1, ncnt; i <= n / 2; ++i) {
    ncnt = 1ll * C(k, k / 2) * (C(k / 2 + i - 1, k / 2) - C(k / 2 + i - 2, k / 2)) % MOD;
    ncnt = 1ll * ncnt * C(n - i + k / 2 - 1, k / 2) % MOD;
    cnt = (cnt + ncnt) % MOD;
    ans = (ans + 1ll * ncnt * i % MOD) % MOD;
  }
  ans = (ans + 1ll * (n + 1) * QSM(2, MOD - 2) % MOD * (QSM(n, k) - cnt) % MOD) % MOD;
  ans = (ans + MOD) % MOD;
  std::cout << ans << '\n';
}

signed main() {
  Prep();
  charming();
  return 0;
}