#include <bits/stdc++.h>

constexpr int MOD = 998244353;

int main() {
	int n, k; scanf("%d%d", &n, &k);

	int ans = 0;
	std::vector<int> a;
	auto dfs = [&](auto&& dfs, int i) -> void {
		if(i == n) {
			int max1 = std::max(a[0], a[1]);
			int max2 = std::min(a[0], a[1]);
			for(int i = 2; i < n; i++) {
				if(a[i] > max1) {
					max2 = max1;
					max1 = a[i];
				} else if(a[i] > max2) {
					max2 = a[i];
				}
			}
			ans = (ans + max2) % MOD;
			return;
		}

		for(int d = 1; d <= k; d++) {
			a.push_back(d);
			dfs(dfs, i + 1);
			a.pop_back();
		}
	}; dfs(dfs, 0);

	printf("%d\n", ans);
	return 0;
}