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#define _CRT_SECURE_NO_WARNINGS
#include <algorithm>
#include <bitset>
#include <cstring>
#include <cstdio>
#include <cmath>
#include <cctype>
#include <cassert>
#include <climits>
#include <ctime>
#include <iostream>
#include <iomanip>
#include <functional>
#include <map>
#include <string>
#include <queue>
#include <stack>
#include <set>
#include <unordered_set>
#include <unordered_map>
#include <vector>
#include <array>
#include <random>

//#pragma GCC optimize("Ofast")
//#pragma GCC target("avx,avx2,fma")
//#pragma GCC optimization ("O3")
//#pragma GCC optimization ("unroll-loops")
using namespace std;

#define all(x) x.begin(), x.end()
#define int long long
#define ld long double

template <class T>
istream& operator >>(istream& in, vector<T>& arr) {
    for (T& cnt : arr) {
        in >> cnt;
    }
    return in;
}
const int mod = 1e9 + 7;
const int N = 501;

int add(int a, int b) {
    if (a + b > mod) return a + b - mod;
    return a + b;
}

int sub(int a, int b) {
    if (a - b < 0) return a - b + mod;
    return a - b;
}

void solve() {
    int n, x, k; cin >> n >> x >> k;
    vector<vector<vector<int>>> dp(k + 1), new_dp(k + 1), pref(k + 1), new_pref(k + 1);
    for (int j = 0; j <= k; j++) {
        dp[j].resize(x + 1);
        new_dp[j].resize(x + 1);
        pref[j].resize(x + 1);
        new_pref[j].resize(x + 1);
        for (int lst = 0; lst <= x; lst++) {
            dp[j][lst].resize(2);
            new_dp[j][lst].resize(2);
            pref[j][lst].resize(2);
            new_pref[j][lst].resize(2);
        }
    }
    for (int lst = 1; lst <= x; lst++) {
        dp[0][lst][0] = 1;
        pref[0][lst][0] = add(pref[0][lst - 1][0], dp[0][lst][0]);
    }
    for (int i = 2; i <= n; i++) {
        for (int j = 0; j <= k; j++) {
            for (int lst = 1; lst <= x; lst++) {
                new_dp[j][lst][0] = add(dp[j][lst][0], dp[j][lst][1]);
                new_dp[j][lst][0] = add(new_dp[j][lst][0], sub(pref[j][x][0], pref[j][lst][0]));
                new_dp[j][lst][1] = add(pref[j][lst - 1][0], pref[j][lst - 1][1]);
                if (j) {
                    new_dp[j][lst][0] = add(new_dp[j][lst][0], sub(pref[j - 1][x][1], pref[j - 1][lst][1]));
                }
                new_pref[j][lst][0] = add(new_pref[j][lst - 1][0], new_dp[j][lst][0]);
                new_pref[j][lst][1] = add(new_pref[j][lst - 1][1], new_dp[j][lst][1]);
            }
        }
        swap(dp, new_dp);
        swap(pref, new_pref);
    }
    cout << add(pref[k][x][0], pref[k][x][1]);
}

signed main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0); cout.tie(0);
    //cout.precision(12);
    //freopen("substring-palindromes.in", "r", stdin);
    //freopen("substring-palindromes.out", "w", stdout);
    //prec();
    int _t = 1; //cin >> _t;
    while (_t--) {
        solve();
        //gen();
    }
}