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();
    }
    
}