#include <bits/stdc++.h>
#include "atcoder/all"
#define debug cout << "OK" << endl;
template<typename T>
inline bool chmax(T& a, const T b) { if (a < b) { a = b; return true; } return false; }
template<typename T>
inline bool chmin(T& a, const T b) { if (a > b) { a = b; return true; } return false; }
inline int Code(char c) {
	if ('A' <= c and c <= 'Z')return (int)(c - 'A');
	if ('a' <= c and c <= 'z')return (int)(c - 'a');
	if ('0' <= c and c <= '9')return (int)(c - '0');
	assert(false);
}
using namespace std;
using namespace atcoder;
#define int long long
constexpr int MOD = 998244353;
constexpr int INF = (1LL << 63);
using minit = modint1000000007;
using minit2 = modint998244353;

template<typename T>
ostream& operator << (ostream& st, const vector<T>& v) {
	for (const T value : v) {
		st << value << " ";
	}
	return st;
}
template<typename T>
istream& operator >> (istream& st, vector<T>& v) {
	for (T& value : v) {
		st >> value;
	}
	return st;
}

int pow_(const int a, const int b, const int m = INF) {
	int res = 1;
	int base = a;
	for (int i = 0; i < 64; i++) {
		if (b & (1ll << i))res *= base;
		res %= m;
		base = base * base;
		base %= m;
	}
	return res;
}
template<typename T>
void to_sum(vector<T>& arr) {
	int n = (int)arr.size();
	for (int i = 0; i < n - 1; i++) {
		arr[i + 1] += arr[i];
	}
	return;
}

//

//

class Solver {
public:
	int T;
	Solver() :T(1) {}
	~Solver(){}
	void multi();
	void solve() const;
	void sp(int x)const;
};
void Solver::multi() {
	cin >> T;
	return;
}
void Solver::sp(const int x)const {
	cout << fixed << setprecision(x) << endl;
	return;
}

void Solver::solve() const {
	int N, D, K;
	cin >> N >> D >> K;
	vector<vector<minit>> DP(N + 1, vector<minit>(K + D + 3, 0));
	DP[0][0] = 1;
	for (int i = 0; i < N; i++) {
		for (int k = 0; k < K; k++) {
			DP[i + 1][k + 1] += DP[i][k];
			DP[i + 1][k + D + 1] -= DP[i][k];
		}
		to_sum(DP[i + 1]);
	}
	cout << DP[N][K].val() << endl;
}

signed main() {
	Solver solver;
	//solver.multi();
	//solver.sp();
	for (int i = 0; i < solver.T; i++)
		solver.solve();
	return 0;
}

/*
* わらびのコードこーどすぺーす
 (σ･∀･)σｹﾞｯﾂ!!
*/