import java.io.*; import java.util.*; import java.util.stream.*; public class Main { static final int MOD = 998244353; public static void main(String[] args) throws Exception { Scanner sc = new Scanner(); int n = sc.nextInt(); int k = sc.nextInt(); long div = pow(n, MOD - 2); long[][] dp = new long[k + 1][n + 1]; dp[0][0] = 1; for (int i = 1; i <= k; i++) { for (int j = 0; j <= n; j++) { if (j > 0) { dp[i][j - 1] += dp[i - 1][j] * j % MOD * div % MOD; dp[i][j - 1] %= MOD; } if (j < n) { dp[i][j + 1] += dp[i - 1][j] * (n - j) % MOD * div % MOD; } } } long ans = 0; for (int i = 0; i <= n && i <= k; i++) { ans += (n + (k - i) / 2) * dp[k][i] % MOD; ans %= MOD; } System.out.println(ans); } static long pow(long x, long p) { if (p == 0) { return 1; } else if (p % 2 == 0) { return pow(x * x % MOD, p / 2); } else { return pow(x, p - 1) * x % MOD; } } } class Utilities { static String arrayToLineString(Object[] arr) { return Arrays.stream(arr).map(x -> x.toString()).collect(Collectors.joining("\n")); } static String arrayToLineString(int[] arr) { return String.join("\n", Arrays.stream(arr).mapToObj(String::valueOf).toArray(String[]::new)); } } class Scanner { BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); StringTokenizer st = new StringTokenizer(""); StringBuilder sb = new StringBuilder(); public Scanner() throws Exception { } public int nextInt() throws Exception { return Integer.parseInt(next()); } public long nextLong() throws Exception { return Long.parseLong(next()); } public double nextDouble() throws Exception { return Double.parseDouble(next()); } public int[] nextIntArray() throws Exception { return Stream.of(br.readLine().split(" ")).mapToInt(Integer::parseInt).toArray(); } public String next() throws Exception { while (!st.hasMoreTokens()) { st = new StringTokenizer(br.readLine()); } return st.nextToken(); } }