import java.io.*;
import java.util.ArrayList;
import java.util.StringTokenizer;

public class Q {
    FastScanner in;
    PrintWriter out;

    public void solve() throws IOException {
        long dp[][] = new long[44][44];
        for (int i = 0; i < 44; i++) {
            dp[i][0] = 1;
            for (int j = 1; j <= i/2; j++) {
                dp[i][j] += dp[i-1][j];
                for (int left = 0; left <= i-2; left++) {
                    int right = i-left-2;
                    if (right < 0) continue;
                    for (int left_con = 0; left_con <= (left == 0 ? 0 : j-1); left_con++) {
                        int right_con = j-1-left_con;
                        if (right == 0 && right_con != 0) continue;
                        long m = 1;
                        if (left > 0 || left == 0 && left_con == 0) {
                            m *= dp[left][left_con];
                        }
                        if (right > 0 || right == 0 && right_con == 0) {
                            m *= dp[right][right_con];
                        }
                        dp[i][j] += m;
                    }
                }
            }
        }
        int n = in.nextInt();
        int k = in.nextInt();
        out.println(dp[n][k]);
    }


    public void run() {
        try {
            //in = new FastScanner(new File("input.txt"));
            //out = new PrintWriter(new File("output.txt"));
            in = new FastScanner(System.in);
            out = new PrintWriter(System.out);
            //err = new PrintWriter(System.err);

            solve();

            out.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    class FastScanner {
        BufferedReader br;
        StringTokenizer st;

        FastScanner(File f) {
            try {
                br = new BufferedReader(new FileReader(f));
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }
        }

        FastScanner(InputStream st) {
            br = new BufferedReader(new InputStreamReader(st));
        }

        String next() {
            while (st == null || !st.hasMoreTokens()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        }

        int nextInt() {
            return Integer.parseInt(next());
        }

        long nextLong() {
            return Long.parseLong(next());
        }

        double nextDouble() {
            return Double.parseDouble(next());
        }

    }

    public static void main(String[] arg) {
        new Q().run();
    }
}