#include <cstdlib>
#include <cctype>
#include <cstring>
#include <cstdio>
#include <cmath>
#include <algorithm>
#include <vector>
#include <string>
#include <iostream>
#include <sstream>
#include <map>
#include <set>
#include <queue>
#include <stack>
#include <fstream>
#include <numeric>
#include <iomanip>
#include <bitset>
#include <list>
#include <stdexcept>
#include <functional>
#include <utility>
#include <ctime>
#include <cassert>
using namespace std;
typedef long long LL;
typedef unsigned long long ULL;
#define MEM(a,b) memset((a),(b),sizeof(a))
const LL INF = 1e9 + 7;
const int N = 1e2 + 10;
const LL mod = 998244353;
LL powmod(LL a, LL b)
{
	LL ret = 1;
	while (b)
	{
		if (b & 1)
			ret = ret * a % mod;
		b >>= 1;
		a = a * a % mod;
	}
	return ret;
}
int main()
{
	//freopen("input.txt", "r", stdin);
	//freopen("output.txt", "w", stdout);
	int n, k;
	cin >> n >> k;
	LL tot = 1LL * n * k % mod * (k - 1) % mod;
	LL rev = powmod(k, n);
	rev = powmod(rev, mod - 2);
	cout << tot * rev % mod << endl;
	return 0;
}