/*
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀       ⠀⠀⠀⠀⠀⠀⠀⣠⡀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀  ⠀⠀ ⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀     ⢀⣠⡯⠀⠀⠀⢠⡐⠀⠀⠀⠀⠀
⠀⠀⠀⢀⣤⠔⠂⠀⠀⠀⢤⣤⣤⣤⣄⣀⣀⣀⣀⡀⠀⢀⣀⣀⣀⡀⠀⠀⠀⢀⢀⣀⣠⣤⣴⣶⣾⠉⠉⠙⣶⠂⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀   ⠀⣰⣿⡟⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠰⣿⣷⣾⣿⣷⣴⣶⣾⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⠏⠉⠛⢿⣿⣿⣿⣿⣿⣿⣿⠿⠿⣿⣶⣿⣿⣿⣿⣤⣂⣀⡀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣀⣠⣤⣤⣤⣴⣦⣾⣿⣿⣿⣶⣦⣴⣶⣶⠀
⠀⠀⠀⣿⣿⣿⠿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣧⣤⣶⣶⣿⣿⣿⣿⣿⣿⣿⣯⣤⣤⣿⡿⠿⠿⠿⠛⠛⠛⠛⠋⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⣽⣿⣿⡟⢻⣿⣿⣿⡟⣿⣿⣿⣿⠉⠉⠁⠀
⠀⠀⠀⣹⣟⣿⣦⠈⠻⠋⢉⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⠏⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣾⣿⣿⣿⣠⣾⣿⣿⣏⣤⣾⣿⣿⣿⡆⠀
⠀⠀⢀⣿⣿⣿⣿⣦⠀⠘⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⠿⠟⢿⣿⡇⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⡧⠀
⠀⠀⢸⣿⣿⣿⣿⣿⡀⢀⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣦⡈⠋⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢻⡿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⠿⠛⡄⠀
⠀⠀⠈⠿⠿⠁⣿⣿⣿⠎⠻⣯⠉⠉⠉⠈⠉⠉⠉⠉⠉⠉⠉⠉⠉⠉⢹⣿⢻⠉⠉⠁⠈⠻⢦⡀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣿⠁⠉⠙⠛⠛⢿⣿⠟⠋⠁⠀⠀⠀⠈⠀
⠀⠀⠀⠀⠀⠀⢹⣿⡟⠀⠀⠈⠳⣄⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠈⢿⠞⠀⠀⠀⠀⠀⠀⠙⠳⠤⠤⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀    ⠀⠀⠀⠁⠀⠀⠀⠀⠀⠸⣿⠀⠀⠀⠀⠀⠀⠀⠀⢀⣀⠀
⠀⠀⠀⠀⠀⠀⢈⡟⠇⠀⠀⠀⠀⠈⠁⠤⠤⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢸⣶⡀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀     ⠀⠀⠀⢹⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠙⠀⠈⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠈⠻⠂⠀⠀⠀⠀  ⠀⠀⠀⠀⠀⠀⠀⠀                             ⠀⠀⡘⡀⠀
⠀⠀⠀⠀⠀⠀                         ⠀⠀⠁⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
*/

#include <iostream>
#include <string>
#include <sstream>
#include <vector>
#include <cmath>
#include <algorithm>
#include <memory.h>
#include <stdio.h>
#include <stack>
#include <deque>
#include <queue>
#include <set>
#include <iterator>
#include <map>
#include <iomanip>
#include <unordered_set>
#include <array>
#include <random>
#include <ctime>
#include <chrono>
#include <cstdlib>
#define int long long
#define pb push_back
#define fir first
#define sec second
#define double long double
#define endl "\n"
#define un unsigned
#define INF 1000000000000009
#define EPS 0.0000000001
#define pii pair<int, int>
#define all(v) v.begin(), v.end()
using namespace std;

const int N = 300009, MOD = 998244353, R = 1 << 20, logn = 19, ABC = 26;

mt19937 rnd(chrono::steady_clock::now().time_since_epoch().count());

signed main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    cout.precision(20);

    int n, k, x;
    cin >> n >> k >> x;

    if (n <= 2)
    {
        cout << 0;
        return 0;
    }

    vector<vector<vector<vector<int>>>> dp(n + 2, vector<vector<vector<int>>>(k + 2, vector<vector<int>>(x + 2, vector<int>(3, 0))));

    for (int i = 1; i < x; i++)
    {
        dp[2][0][i][2] = 1;
        dp[2][0][i][1] = i - 1;
        dp[2][0][i][0] = x - i;
    }

    for (int len = 3; len <= n; len++)
    {
        for (int cnt = 0; cnt <= k; cnt++)
        {
            for (int height = 1; height <= x; height++)
            {
                for (int last = 0; last <= 2; last++)
                {
                    if (last == 0)
                    {
                        for (int i = 1; i < height; i++)
                        {
                            dp[len][cnt][height][last] += dp[len - 1][cnt][i][0] + dp[len - 1][cnt][i][2];

                            if (cnt)
                                dp[len][cnt][height][last] += dp[len - 1][cnt - 1][i][1];
                        }
                    }
                    else if (last == 1)
                    {
                        for (int i = height + 1; i <= x; i++)
                        {
                            dp[len][cnt][height][last] += dp[len - 1][cnt][i][0] + dp[len - 1][cnt][i][1] + dp[len - 1][cnt][i][2];
                        }
                    }
                    else
                    {
                        dp[len][cnt][height][last]+=dp[len-1][cnt][height][0] + dp[len - 1][cnt][height][1] + dp[len - 1][cnt][height][2];
                    }
                }
            }
        }
    }

    int ans = 0;

    for (int i = 1; i <= x; i++)
        for (int last = 0; last <= 2; last++)
            ans += dp[n][k][i][last];

    cout << ans;
    return 0;
}

/*

*/