#include<iostream>
#include<string>
#include<iomanip>
#include<cmath>
#include<vector>
#include<algorithm>
#include<utility>

using namespace std;

#define int long long
#define endl "\n"

constexpr long long INF = (long long)1e18;
constexpr long long MOD = 1'000'000'007; 

struct fast_io {
	fast_io(){
		std::cin.tie(nullptr);
		std::ios::sync_with_stdio(false);
	};
} ;
// } fio;

signed main(){
	cout<<fixed<<setprecision(10);
	
	int N, d, K;
	vector<vector<int>> dp;
	
	cin>>N>>d>>K;
	
	dp.resize(2, vector<int>(K+1));
	
	dp[0][0] = 1;
	
	for(int i = 0; i < N; i++){ //cout<<i<<endl;
		for(int j = 0; j < K; j++){ //cout<<j<<endl;
			for(int k = 1; k <= d; k++){
				if(j+k <= K){
					dp[(i+1)%2][j+k] += dp[i%2][j];
					dp[(i+1)%2][j+k] %= MOD;
				}
			}
		}
		for(int j = 0; j <= K; j++){
			dp[i%2][j] = 0;
		}
	}
	//cout<<"x"<<endl;
	cout<<dp[(N)%2][K]<<endl;
	
	return 0;
}