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

#include <atcoder/modint>
using namespace atcoder;
using mint = modint998244353;

#pragma GCC target("avx2")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")

int main()
{
  int N, M;
  cin >> N >> M;

  vector<int> D(N + 10, 0);
  for (int i = 2; i <= M; i++)
  {
    for (int k = 1; k * i <= N; k++)
    {
      D[k * i - 1]++;
    }
  }

  vector<mint> pw(N + 10);
  pw[0] = 0, pw[1] = 1, pw[2] = M - 2;
  for (int i = 2; i < N; i++)
  {
    pw[i + 1] = (M - 1) * pw[i];
  }

  vector<mint> dp(N + 10, 0);
  vector<mint> dp2(N + 10);
  dp2[0] = 1;
  for (int i = 0; i < N; i++)
  {
    dp2[i + 1] = (M - 1) * dp2[i];
  }

  for (int i = 0; i <= N; i++)
  {
    for (int j = 0; j < i; j++)
    {
      dp[i] += dp2[j] * D[i - j];
    }

    for (int j = 0; j < i; j++)
    {
      dp2[i] -= dp[j] * pw[i - j];
    }
  }

  mint ans = ((mint)M).pow(N) - dp2[N];
  cout << ans.val() << endl;
}