#include <bits/stdc++.h>

using namespace std;

#define ll              long long
#define dd              double
#define pb              push_back
#define mp              make_pair
#define X               first
#define Y               second
#define forn( i, n )    for( ll i = 0; i < (ll) (n); i ++ )
#define endl            '\n'

ll n, k;
ll dp[44][44];

int main( void ) {
    cin >> n >> k;
    dp[2][1] = 1;
    forn( i, 44 ) {
        dp[i][0] = 1;
    }
    for( ll i = 3; i <= n; i ++ ) {
        for( ll j = 1; j <= k; j ++ ) {
            for( ll x = 0; x < i; x ++ ) {
                for( ll ii = x + 1; ii < i; ii ++ ) {
                    for( ll jj = 0; jj < j; jj ++ ) {
                        //cout << i << " " << j << endl;
                        //cout << ii - 1 - x << " " << jj << endl;
                        //cout << i - 1 - ii << " " << j - 1 - jj << endl << endl;
                        dp[i][j] += dp[ii - x - 1][jj] * dp[i - 1 - ii][j - 1 - jj];
                    }
                }
            }
        }
    }
    cout << dp[n][k] << endl;
    return 0;
}