#include <iostream>
#include <vector>
using namespace std;
const long long MOD = 1000000007;
int main(){
	int N, d, K;
	cin >> N >> d >> K;
	vector<vector<long long>> dp(N + 1, vector<long long>(N * d + 2, 0));
	dp[0][0] = 1;
	for (int i = 0; i < N; i++){
		for (int j = 0; j <= i * d; j++){
			dp[i + 1][j + 1] += dp[i][j];
			dp[i + 1][j + d + 1] += MOD - dp[i][j];
		}
		for (int j = 0; j <= (i + 1) * d; j++){
			dp[i + 1][j + 1] += dp[i + 1][j];
			dp[i + 1][j + 1] %= MOD;
		}
	}
	cout << dp[N][K] << endl;
}